Building Cheap Miners : My "Secret" - page 6.

PharmEcis

jr. member

Activity: 176

Merit: 1

My personal opinion is XMR is gonna fuck something up, RandomX isn't going to be the magic bullet they think it will and they will eventually be forced to embrace ASICs.

New AMD chips are also putting out 1/2 the hash of a full R815 on a single chip for a 1/3 of the juice.

I'm hoping they will make something, but I really feel like these servers along with a lot of other things I bought over a year ago were a fools folly.

Cheesy

MinersRus

member

Activity: 214

Merit: 24

I just upgraded one Dell R815 from quad 12-core Opteron 6238's to quad 12-core Opteron 6348's and retested.

sudo ./TurionPowerControl -psmax 1

seq 0 7 | xargs -P 0 -I node numactl -N node ./randomx-benchmark --mine --largePages --jit --nonces 100000 --init 6 --threads 6

4x 12-core Opteron 6238's produces 1178 H/s per node or 9424 H/s overall

4x 12-core Opteron 6348's produces 1326.5 H/s per node or 10612 H/s overall +12.6% higher

The clock speed difference between the 6238 (2900 MHz) and the 6348 (3100 MHz) is 200 MHz. That works out to be 6.9% faster for the 6348 so the additional 5.7% gain for the 6348 must be because of architectural changes.

Those architectural changes are detailed here: https://www.tomshardware.com/reviews/fx-8350-vishera-review,3328-3.html

AMD Opteron 6238 specifications: http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206238.html
AMD Opteron 6348 specifications: http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206348%20-%20OS6348WKTCGHK.html

So if given a choice pick the 6300 series Opteron's over the 6200 series.

This link (https://github.com/tevador/RandomX) shows that a AMD Ryzen 7 1700 gets about 4100 H/s so the 10612 H/s is about equal to 2.59 Ryzen 7 1700's.

MinersRus

member

Activity: 214

Merit: 24

Quote from: PharmEcis on July 01, 2019, 08:00:39 AM

Hey hey hey good to see some of us are still at it and made it through this very very short winter... (still don't believe we are totally out of it yet!)

My R815's have been idle for months since Swap forked from CN Superfast to C29s except for a short period for Wownero's fork a few weeks ago where I was slaughtering solo blocks for two days.

Mine have been idle except for updating Ubuntu and for Testing RandomX.

Quote from: PharmEcis

My Proliant boxes have been hosting GPUs but not CPU mining. I've been slowly moving to smaller less dense rigs and I'm also moving into FPGA's.

I almost got rid of all my GPUs but my electric is cheap (avg'd 6.7c per KWh last month). I've been moving towards FPGAs since last year. Hasn't worked out exactly as hoped but still have faith.

I plan to sell off the seven HP DL580 G7's and the GTX 750's I have. As you mentioned the HP DL580 G7 in a 4U case is pretty dense and the Dell R815's in a 2U case produce more RandomX H/s than the HP DL580 G7 at lower power.

WOW your electric rate of 6.7c per KWh is fantastic. My two year plan just expired June 19th and it was down to 6.8c per KWh in June. Previous months were 6.9c, 6.9, 6.9 and 7.5c per KWh. It looks like OnCore rates have been dropping which was the reason for the drops. That said I had to renew and the best plan I found was 22% higher at 8.3c per KWh. It is a three year plan so I am locked to that until June 2022. A bunch of plans I rejected had rates for over 2000 KWh per month jumping to 14c (or more) per KWh. Those plans would be a killer for mining.

Quote from: PharmEcis

I am ready to turn these guys on for the XMR fork, but as you stated, profit is yet to be seen.

October can't get here fast enough.

In the mean time I am upgrading the five Dell R815's that I have with Opteron's that are faster and/or have more cores so that those servers produce even higher RandomX H/s.

Three of my R815's have quad Opteron 6238's and the other two have quad Opteron 6234's.

I managed to pick up:

4x 16-core Opteron 6378's for total of $69.29
http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206378%20-%20OS6378WKTGGHK.html

These are only 100 MHz slower than the Opteron 6380's that you have in your R815's. The Opteron 6378 will be about 3.6% slower.

http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206380%20-%20OS6380WKTGGHK.html

I also picked up:
10x 12-core Opteron 6348's for total of $64.10

http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206348%20-%20OS6348WKTCGHK.html

and

2x 16-core Opteron 6276's for total of $17.71

http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206276.html

I have a Dual Opteron Supermicro Server that currently has 2x Opteron 6348's in it.

I plan to replace the two 12-core Opteron 6348's with the two newly purchased 16-core Opteron 6276's.
That system should be 11.8% faster with those changes.

The two current R815's that have quad 12-core Opteron 6234's will be upgraded to quad 12-core Opteron 6348's
Those systems should be 14.8% faster with those changes.

The other four 12-core Opteron 6348's will be used in a new purchase of an R815.

Quote from: PharmEcis

We might have periods of profitability but it's time to scrap these hunks of junk.

With the upcoming Monero Fork to RandomX I don't believe that the Dell R815's are junk because GPU mining will be futile and CPU mining will rain supreme for RandomX.

Take a look at these RandomX GPU RandomX H/s results
https://github.com/SChernykh/RandomX_CUDA

A single Opteron 6238 produces 2356 H/s where as a Titan V only produces 2199 H/s.
And a single Opteron 6348 produces 2653 H/s where as a Tesla V100 only produces 2524 H/s.

AMD GPU mining of RandomX is even worse. A Vega 64 can only get 1200 H/s on RandomX.

PharmEcis

jr. member

Activity: 176

Merit: 1

Hey hey hey good to see some of us are still at it and made it through this very very short winter... (still don't believe we are totally out of it yet!)

My R815's have been idle for months since Swap forked from CN Superfast to C29s except for a short period for Wownero's fork a few weeks ago where I was slaughtering solo blocks for two days. My Proliant boxes have been hosting GPUs but not CPU mining. I've been slowly moving to smaller less dense rigs and I'm also moving into FPGA's.

I almost got rid of all my GPUs but my electric is cheap (avg'd 6.7c per KWh last month). I've been moving towards FPGAs since last year. Hasn't worked out exactly as hoped but still have faith.

I am ready to turn these guys on for the XMR fork, but as you stated, profit is yet to be seen.

I've learned a bunch since I started. This thread is one of the first social media things I had involvement in for mining. Considering that I was a total noob just a year and a half ago, it's kind of funny to think that I'm one of the founders for a coin now.

I still lurk but at this point, I think the days of our old server iron making money are more than likely over. We might have periods of profitability but it's time to scrap these hunks of junk. Cheesy

MinersRus

member

Activity: 214

Merit: 24

Good news for Dell R815 owners. RandomX puts these servers back in the mining Monero game.

RandomX testing on a DELL R815 with 4x Opteron 6238's

Opteron 6238 Specs:
http://www.cpu-world.com/CPUs/Bulldozer/AMD-Opteron%206238.html

sudo sysctl -w vm.nr_hugepages=9600

seq 0 7 | xargs -P 0 -I node numactl -N node ./randomx-benchmark --mine --largePages --jit --nonces 100000 --init 6 --threads 6

Produces:

Code:

Running benchmark (100000 nonces) ...
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1068.57 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1067.57 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1067.37 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1067.33 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1066.09 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1066.65 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1066.14 hashes per second
Calculated result: d6660144e9a2e68bf47d7cc8afc206672e72f82dfff69fe0d974531e85f7504f
Performance: 1064.69 hashes per second

Or a total hashrate of 8534 H/s

If you have Opterons with 16 cores change the above command to have --init 8 --threads 8

------------------------------------------

EDIT: I forgot about doing the: sudo ./TurionPowerControl -psmax 1

This brings the total hashrate to 9427 H/s or about 10.5% faster

Also tested 4x Opteron 6234's with TurionPowerControl -psmax 1: 8832 H/s

MinersRus

member

Activity: 214

Merit: 24

For HP DL580 G7 miners that are here I have done some testing on it for the upcoming Monero RandomX mining fork this October.

For those who don't know RandomX:

https://github.com/tevador/RandomX

Quote

RandomX is a proof-of-work (PoW) algorithm that is optimized for general-purpose CPUs. RandomX uses random code execution (hence the name) together with several memory-hard techniques to minimize the efficiency advantage of specialized hardware.

RandomX design
https://github.com/tevador/RandomX/blob/master/doc/design.md

My test system is a HP DL580 G7 system has the following configuration:

4x Xeon E7-8837
4X E7 Memory Cartridges with 4x PC3-10600R 4GB memory sticks installed in the white slots. One of the Memory Cartridges must be installed for each processor.

Ubuntu 16.04 with single GTX 750 for video. Only CPU's used for mining no GPU's.

I did these commands to download and clone and compile the RandomX benchmark.

git clone https://github.com/tevador/RandomX.git
cd RandomX
mkdir build && cd build
cmake -DARCH=native ..
make

Be sure to enable LargePages to be at least 4800:

sudo sysctl -w vm.nr_hugepages=4800

Be sure numactl is installed:
sudo apt install numactl

Long story short since NUMA is still not in the benchmark RandomX miner you need to benchmark using this command:

seq 0 3 | xargs -P 0 -I node numactl -N node ./randomx-benchmark --mine --largePages --jit --nonces 100000 --init 8 --threads 8

That command runs four benchmarks each assigned to only one processor and that processor only uses its local memory.

This is the results I have obtained:

Code:

Running benchmark (100000 nonces) ...
Calculated result: 9b22794882187000d62c6d2b228fab5e585767aaaa5eb74905b0c7c00fcbdad8
Performance: 2319.77 hashes per second
Calculated result: 9b22794882187000d62c6d2b228fab5e585767aaaa5eb74905b0c7c00fcbdad8
Performance: 2296.53 hashes per second
Calculated result: 9b22794882187000d62c6d2b228fab5e585767aaaa5eb74905b0c7c00fcbdad8
Performance: 2289.64 hashes per second
Calculated result: 9b22794882187000d62c6d2b228fab5e585767aaaa5eb74905b0c7c00fcbdad8
Performance: 2280.22 hashes per second

That is a total of 9186 H/s for the four processors or an average of 2296 H/s for each Xeon E7-8837.

As users of the HP DL580 G7 know it is somewhat of a power hog.

This is the power usage(s):

Idle: 275 Watts
Running RandomX benchmark from above: 720 Watts

These power numbers are from the sudo hpasmcli -s "show powersupply" command and HP Software I have previously mentioned.
I have a single 94% efficient power supply in the system so actual power consumed at the meter should be about 766 Watts.

This link (https://github.com/tevador/RandomX) shows that a AMD Ryzen 7 1700 gets about 4100 H/s so the 9186 H/s is about equal to 2.25 Ryzen 7 1700's.

sundownz06

newbie

Activity: 110

Merit: 0

The Z400s and Dell R815s are still doing great. Also the two Dell towers I built have been solid.

I am starting to see some of my very first power supplies going out on me... but Rosewill has a 5-year warranty and covers them reliably.

Also some random GPU failures here and there.

Interestingly... my broken PNY 1080 cards sell on e-bay for around $200 or so every time. I can't explain such a high value... but I've sold 4 since the warranty expired.

----------

I am moving quite a bit of power back to LTHN coin... they say their full VPN client will be ready this month.

I've also mined a fair amount of BitTube which rallied 40% today... wish I had mined more! Haha.

PharmEcis

jr. member

Activity: 176

Merit: 1

Jacob, check your PM.

mys5droid

jr. member

Activity: 109

Merit: 1

mine pexa @ pool.easyx.cc

I get hardware for free. I go to Canadian Tire in the electronics bin outside... I feel uncomfortable just walking up and robbing it of all the computers, so I bring a piece of electronics garbage with me and exchange 1 for 1

Most are shit but you can find decent parts for free

You wont get much power efficient hardware there though, you will end up negative profits...

I just mine as an easy way in to the market, so even if I am mining at minus 15 cents profit, I really don't care.

sundownz06

newbie

Activity: 110

Merit: 0

Quote from: sundownz06 on October 30, 2018, 04:45:08 PM

Quote from: sundownz06 on August 10, 2018, 05:19:41 PM

Quote from: MinersRus on August 08, 2018, 01:39:00 PM

With the price of Monero XMR falling below $100 (currently at $95) I have shut down all my HP DL580 and Dell R815 Servers. They are no longer profitable at that price. Also it doesn't help that the temperatures are now above 100 degrees again here in Texas as that causes all the server fans to run at 100%.

I will keep my four Vega 56's mining but that is all I will be running until the price rises above $120 or Fall/Winter comes.

Profit is quite bad now on the R815s -- I'm looking at 10 cents a day as of now on XMR, haha. I had a pretty darn good run with them initially... I mined 67 coins of XMR since 4 months ago... sold them along the way.

I will keep them on as long as it's above zero... and perhaps even a bit below zero on speculative coins... I already converted 11 of my R815s and all my AMD cards to XTL (Stellite) as a bit of a speculative gamble. May put the rest of my R815s back onto ITNS coin which is my other speculative coin.

-----

But I am still very pleased with my HP Z400s -- they've been handling the summer heat well.

Further update on the Z400s... still all going strong.

I've really only had hard drive failure issues on the refurb Z400 systems... and that is a cheap fix.

-----

On the R815s... I am doing roughly double my power cost on Webchain as of now too -- so they are also holding on. Totally stopped mining Monero.

Heat from my mining operation is heating three major areas of my warehouse -- so that is super nice for winter =)

sundownz06

newbie

Activity: 110

Merit: 0

Quote from: MinersRus on November 01, 2018, 09:04:34 PM

Quote from: sundownz06 on October 30, 2018, 04:45:08 PM

On the R815s... I am doing roughly double my power cost on Webchain as of now too -- so they are also holding on. Totally stopped mining Monero.

Do you mine Webchain and sell some or all of it?

I have 7x HP DL580's and 5x R815's powered off as they are unprofitable on Monero but if I could mine Webchain and exchange it to BTC and then get BTC to Coinbase that would be great. I am a small time miner and have to pay my electric bill from my mining operations.

I am holding a good chunk of it but I have sold a few 1000 dollars worth.

sundownz06

newbie

Activity: 110

Merit: 0

Quote from: 4thKor on November 05, 2018, 06:15:09 AM

Quote from: MinersRus on November 04, 2018, 11:28:43 AM

I haven't heard of ROIcoin until you mentioned it.

On the subject on ROIcoin is there a market (exchange) where they can be traded to BTC?

ROICoin is relatively new. I just discovered it myself a few weeks ago. It is listed on a few small exchanges, but the problem is no one is currently trading. Everybody is depositing due to the huge returns. The original deposits are maturing in the next few months, so consensus is that the market will start opening up as miners start selling to recoup costs. The devs are also pursuing listings. There has been some bad luck with exchanges in the past, so they're being cautious on choice of new ones.

As for power used on these beasts, I'm currently paying that out of my pocket. Of all the coins I've researched and mined this one stands way out above the rest for me. I see a tremendous opportunity. I also believe this thing will take off and become a top coin in the future. I might add that the target audience are the GPU miners with their CPU's not doing much to contribute to their endeavors. Not many miners are dedicated to just mining ROI as I am.

The thing to do would be to research ROI. I have, and I'm impressed! And do the math on deposits..... Grin

I am mining some ROI Coin as well -- seems intriguing... I won't put a huge amount of my resources on it but I think a small amount is worth it.

4thKor

newbie

Activity: 21

Merit: 0

Anybody know of a step by step guide for installing XMRigCC in Ubuntu 18.04? Finally getting time to plop some GPU's in these things, but don't know enough about Linux to get this miner going. I'm basically stuck from the gitgo.

I'll be running Pro Duo 8gb, RX580's, and Vega 64's. Same cards per rig to at least simplify that part of it.

Discovered a new coin that at least SOME of you are aware of, and I need to consolidate stuff for efficiency. Wink

PharmEcis

jr. member

Activity: 176

Merit: 1

loudmining.com under downloads!

MinersRus

member

Activity: 214

Merit: 24

Quote from: PharmEcis on August 31, 2018, 05:52:21 PM

With more and more GPUs coming online thanks to the Loud guys adding the algo to xmrig and xmr-stak for GPUs w/ a 3% dev fee, I feel the nethash is going to go up and profitability is going to go down. Especially when someone I know has gone from 70KH/s to 80KH/s in the last 2 days and has more rigs to throw at it once he finishes accumulating what he wants with XTL. Wink

I had gotten up to 25KH/s but my vegas aren't reporting anywhere near pool side what they are miner side so I put them back on something else I've been speculating on. Still #2 after you know who though! Cheesy

As an aside, I did reach out to the good Doktor from SRBminer and he is looking into adding webchain support for SRB. That means a well polished miner with only .85% dev fee instead of what the Loud guys did of just adding an algo to a miner and then slapping a 3% dev fee on that. I actually really don't like what they did. They opened pandora's box in a way by allowing GPUs to come to the party that was CPU only and they did it not for their own cards (from what I'm aware of they have old GPUs), but did it for that 3% dev fee when they really didn't do much at all. Oh and that 3% is forced. You can change it but it will always be 3% and it's binary release only, no source for those of us who can compile and edit out fees.

SRBminer has still not added Webchain so instead of my HP DL580 G7's with 8x GTX 750's powered down because they are unprofitable I would like to use that "Loud guys adding the algo to xmrig and xmr-stak for GPUs w/ a 3% dev fee" miner. Can you point me to where I might obtain it. Thanks.

FYI: Here is what my 2x HP DL580 G7's with 8x GTX 750's with negative 20% profit on Monero is:
https://www.cryptocompare.com/mining/calculator/xmr?HashingPower=6418&HashingUnit=H%2Fs&PowerConsumption=2114&CostPerkWh=0.074&MiningPoolFee=1.0

Hopefully Webchain would be profitable on them.

4thKor

newbie

Activity: 21

Merit: 0

Quote from: MinersRus on November 04, 2018, 11:28:43 AM

I haven't heard of ROIcoin until you mentioned it.

On the subject on ROIcoin is there a market (exchange) where they can be traded to BTC?

ROICoin is relatively new. I just discovered it myself a few weeks ago. It is listed on a few small exchanges, but the problem is no one is currently trading. Everybody is depositing due to the huge returns. The original deposits are maturing in the next few months, so consensus is that the market will start opening up as miners start selling to recoup costs. The devs are also pursuing listings. There has been some bad luck with exchanges in the past, so they're being cautious on choice of new ones.

As for power used on these beasts, I'm currently paying that out of my pocket. Of all the coins I've researched and mined this one stands way out above the rest for me. I see a tremendous opportunity. I also believe this thing will take off and become a top coin in the future. I might add that the target audience are the GPU miners with their CPU's not doing much to contribute to their endeavors. Not many miners are dedicated to just mining ROI as I am.

The thing to do would be to research ROI. I have, and I'm impressed! And do the math on deposits..... Grin

MinersRus

member

Activity: 214

Merit: 24

Quote from: 4thKor on November 03, 2018, 05:09:50 AM

Just an update. Switched out the I/O board ($30 on eBay) on the DL580 that wouldn't boot with E7's and am now up and running. Using standard mem cartridges too, which is great!

I've also tested ROI coin with several memory configurations and the best hash is definitely achieved using all eight cartridges, using two 4gb mem sticks per. Haven't tried one yet, but really don't see a need to either. Setting huge_pages to 1024 is also optimal. Plus I've figured out how to achieve the same hashes with 8837's as with 4870's. A little tweaking on settings and all is well! These processors are pretty amazing.

You guys really should check out ROI coin. If you deposit coins for a one year period the returns are astronomical. It's a relatively unknown coin right now, so difficulty is very low. It also equates to the coin not being very high in value, but with the team of devs behind it and some time I'm totally confident this will change. And even if it doesn't increase in value after three years of rolling everything into deposits, which is unlikely as more people get on board, the returns are absolutely amazing!

I haven't heard of ROIcoin until you mentioned it. In fact I misinterpreted your post where you asked: "Is anybody running ROI on a DL-580 G7?". I thought you were asking about "Return on Investment" on the purchase price of the HP DL580 G7 and the cost of mining on it. That was why I was posting about reducing power these systems use when mining.

As an example I have two HP DL580 G7's each with 4x E7-8837 Xeon Processors and 8x Nvidia GTX 750 GPUs. When mining Monoreo they use 2114 watts for both or 1057 watts each. They are currently powered down as the profitability has been negative recently. Today it is a few dollars on the plus side:

https://www.cryptocompare.com/mining/calculator/xmr?HashingPower=6418&HashingUnit=H%2Fs&PowerConsumption=2114&CostPerkWh=0.074&MiningPoolFee=1

2% profit and paying $112.63 for electricity and only earning $3.34 is not worth it. If Monero gets back to $130 or higher then I will turn them back on.

I do hope that your electricity cost is low as these systems do burn the power and since you are using seven more cartridges that is an additional 210 watts per system above what I am seeing.

Have you installed HP-Health on your system?
https://bitcointalksearch.org/topic/m.47096127

If you have then doing: sudo hpasmcli -s "show powersupply"
will show you the power used by the power supplies installed. To get the wall power take into the account the power supply efficiencies. If for example the power supplies are labeled 94% on the fan then take your measured power and divide by 0.94 to get the wall power. Example 888 watts divided by 0.94 is 945 watts.

On the subject on ROIcoin is there a market (exchange) where they can be traded to BTC?

4thKor

newbie

Activity: 21

Merit: 0

Just an update. Switched out the I/O board ($30 on eBay) on the DL580 that wouldn't boot with E7's and am now up and running. Using standard mem cartridges too, which is great!

I've also tested ROI coin with several memory configurations and the best hash is definitely achieved using all eight cartridges, using two 4gb mem sticks per. Haven't tried one yet, but really don't see a need to either. Setting huge_pages to 1024 is also optimal. Plus I've figured out how to achieve the same hashes with 8837's as with 4870's. A little tweaking on settings and all is well! These processors are pretty amazing.

You guys really should check out ROI coin. If you deposit coins for a one year period the returns are astronomical. It's a relatively unknown coin right now, so difficulty is very low. It also equates to the coin not being very high in value, but with the team of devs behind it and some time I'm totally confident this will change. And even if it doesn't increase in value after three years of rolling everything into deposits, which is unlikely as more people get on board, the returns are absolutely amazing!

MinersRus

member

Activity: 214

Merit: 24

Quote from: sundownz06 on October 30, 2018, 04:45:08 PM

On the R815s... I am doing roughly double my power cost on Webchain as of now too -- so they are also holding on. Totally stopped mining Monero.

Do you mine Webchain and sell some or all of it?

I have 7x HP DL580's and 5x R815's powered off as they are unprofitable on Monero but if I could mine Webchain and exchange it to BTC and then get BTC to Coinbase that would be great. I am a small time miner and have to pay my electric bill from my mining operations.

sundownz06

newbie

Activity: 110

Merit: 0

Quote from: sundownz06 on August 10, 2018, 05:19:41 PM

Quote from: MinersRus on August 08, 2018, 01:39:00 PM

With the price of Monero XMR falling below $100 (currently at $95) I have shut down all my HP DL580 and Dell R815 Servers. They are no longer profitable at that price. Also it doesn't help that the temperatures are now above 100 degrees again here in Texas as that causes all the server fans to run at 100%.

I will keep my four Vega 56's mining but that is all I will be running until the price rises above $120 or Fall/Winter comes.

Profit is quite bad now on the R815s -- I'm looking at 10 cents a day as of now on XMR, haha. I had a pretty darn good run with them initially... I mined 67 coins of XMR since 4 months ago... sold them along the way.

I will keep them on as long as it's above zero... and perhaps even a bit below zero on speculative coins... I already converted 11 of my R815s and all my AMD cards to XTL (Stellite) as a bit of a speculative gamble. May put the rest of my R815s back onto ITNS coin which is my other speculative coin.

-----

But I am still very pleased with my HP Z400s -- they've been handling the summer heat well.

Further update on the Z400s... still all going strong.

I've really only had hard drive failure issues on the refurb Z400 systems... and that is a cheap fix.

-----

On the R815s... I am doing roughly double my power cost on Webchain as of now too -- so they are also holding on. Totally stopped mining Monero.

Topic: Building Cheap Miners : My "Secret" - page 6. (Read 60235 times)