Topic: i am offering help/advice on biulding rigs (Read 3196 times)

with my 1090t cpus i have found lowering the multiplyer to x8 and voltage to 1.1v it uses th same as disabaling 5 cores lol

You can also disable any extra cores on the cpu which can reduce power draw significantly, it's the difference between my rig not booting and being able to run a 7970 at 1085/1500 mining litecoin.

i have only ever used 7950 and 7970s  for mining

nomaly the total wattage covers what it pulls from the motherboard

i have found if you use a lowpower cpu or  underclok / undervolt   motherboard cpu and ram can be less than 120w

i would say looking at the numbers that psu should be fine ( if your on 110v it would pull upto 16A from the wall )

buy your self a plug in watt meeter to check what wattage you are puling from the wall just to be safe

if you have any questions just ask

zack

How much power rig with 3 5970 and 1 6990 will need for LTC and BTC mining?. I am assuming LTC takes more.

As per my reading 5970 takes around 300w and 6990 around 400w at top load.

So this means 1300 w with 200 w for Mobo etc. should a 1600w LEPA would do ?

Also i read, card take around 75w from mobo so does that means its 375 for a single 5970 or this is included in the 300w?

Till now i have found this(http://www.amazon.com/LEPA-1600-Watts-Crossfire-Certified-G1600-MA/dp/B007W5TV6K/ref=sr_1_1?s=electronics&ie=UTF8&qid=1371839485&sr=1-1&keywords=lepa+1600w).

Any other recommendation ?

the room is seporated from the rest of the house
i have smoke alarms that i have riged relays onto so if 1 of them goes off all comps are disconected from the mains there is sombody in the house 24/7 and know how to put a fire out ( co2 fire exting )

It is not a troll idiot boy... some people just don't know the risk......
http://www.scmp.com/news/hong-kong/article/1212060/fire-breaks-out-south-horizons-one-injured

These are also 'fake' wooden floors over concrete, not to mention the smoke is what kills, 1 PVC crate in a small area is already enough to kill a family....

i have croshair iv mother boards ( managed to get 20 used ones for just over 2000 gbp best motherboerds i have ever used
i run 4 cards with non powerd risers no problems

you would be suprised how hot vrms get i beleve that are rated 120c but amd rate them 100c ( im gesing its to be on the safe side )

just rember when you underclock to undervolt aswell 

Yeah the debate about powered risers goes on and on, I've read a lot about that. I found a fella who has the same Mobo as me with x6 cards running perfectly, 3 powered risers, 3 unpowered. So I'm in the process of collaborating with him, it looks like I need to presence short a few pcie slots and I'll be good to go.

I will take note of the VRM temps, Id imagine there below 100

I'll give that second pool a look, I used to use give-me-ltc, but have moved on from ltc sadly.

And underclocking the cpu to save power and less load is super clever, I like your thinking. Deft will tweak the bios a little for that.

gregyoung14

there is alot of debait about powerd risers do a quick serch on bitcoin talk or google
vrm temps should be ok up to 100 (i never let my cards get over 80c vrm2)
i have mined litecoin on give-me-ltc 0-1% stales
i have mined pxc on phenixmining.com 0.5-1% stales

i underclock the cpu saves power and puts less load on the motherboard

The power isn't an issue if the PSU can handle it and is stable. I don't pay for electricity, it's included in rent with no cap. I had the clock/mem at about 1150/1400 for 680 and before 1050/1400 which returns like you said about 630 but I was getting a much higher rejection rate, I'm starting to wonder though if that was the pool and not anything on my end. Though those hash rates were in windows, in xubuntu, i get about 80 less hashes. What drivers/sdk are you using in Xubuntu? And how many cards do you have stable in one rig in xubuntu? Also do you have any way of under volting your cards in xubuntu? My cards undervolt fine in afterburner in windows, cgminer isn't able to force the volt lower or cgminer is reporting in accurate numbers. Either or.


With this information does that suggest that I should absolutly need a  powered 1x to 16x? Because the cards do need some power from the board, right?

I'm thinking about solo mining, its a possiability. I prefer a pool though for accessibility and tracking information. I havent been able to open the ports needed to RDC into my rig from outside my local connection. My internet is through my apartment so before it connects to a large ISP it goes through the apartments servers and what not, which I can't get access to.

Why should I underclock the cpu? Lower power draw? any other reasons?

I've only been looking at GPU temps, should I be watching the vrm more carefully? What are safe/good temps

I have 8gb of ram, but cgminer doesn't need ram the way reaper does, my physical memory used never breaks 15%

What coin are you mining with 1% stales and which pool?

i only run windows with 4 max cards per rig ( 900w undervolted 630kh or 1100w standad voltages ) have you confermed the voltages with gpuz ?

i use a 1200w platinum psu with each 4 cards (ax1200)

if you run 6 cards on a 1600w psu wou will be running it verry neer its limet

if i rember corectly
pcie 16 can pull 75w from the board
pcie 8   can pull 50w
pcie 4   can put 25w
pcie 1   was less

if your mining new script coins solo mine them https://bitcointalksearch.org/topic/tutorial-solo-mining-litecoins-guide-windows-83371

all i know about the rivers i used was thay were the newest ones 50 days ago

underclock the cpu asmuch as posable

how much ram do you have ? each card on my com uses 1.5gb system ram when using reaper

have you looked at the card vrm temps in gpuz ?

with 4 cards at 630-640kh i get around 1% stales  when pool mining

I'll give your questions a shot (and I assume we're talking Litecoin/Scrypt):

You should be able to get by with a 1600 for the 6 7950s, the problem with the 1000 + 600  was probably the split, the 600 could probably only power two of the cards, and 150W of its power was being left unused.  

You can go PCIe 1x to 16x for GPUs without a powered extender without any trouble. In my experience, powered extenders provide no benefit.

I have about a 1% rejection rate and I have 7950s tuned to 630-650 with core around 1050Mhz and memory at 1400.
You can push these cards to 1150 core / 1575 memory (maybe more), and that is probably what you're doing if you're getting 680, but it isn't worth it when you take into account the increased rejection rate and that it is about 50W additional power draw (per card) with 1150/1575 as compared to 1050/1400.
So unless electricity is free for you, that extra 30-50 Kh/s is not worth it for 50W more power.

I use cgminer and xubuntu for everything.

there is a program caluld everst ultimate edition tou can download if free for 30 days then delete it after lol

i hate windows 8 stick with windows 7 if you can 8 is only good with a toutch screen

tthis is my sesting rig http://s1315.photobucket.com/user/zackclark70/library/ it is alot neeter than then the pick were taken

Hey interesting thread you got going, lets see if you can offer me any insight.

I'm trying to get a x6 7950 up and running smoothly. I've been doing some preliminary testing on different, OS's, tried, BAMT, CentOS, Xubuntu, Ubuntu, Windows, I've cycled through all of these a million times. Originally I had a 850w corsair and 600w corsair, but that was a no go. Tried a 1000w corsair and 600w corsair still no go, tomorrow I give it a run with a 1600w Lepa, that'll solve my power promblems hopefully.

I'm running MSI 7950's the R7950 TWIN FROZR 3GD5/OC to be specific. Now with this card under volted at 1.087 and many other settings in cgminer, I can easily hit 680, with close to 12% reject shares in Windows. In Xubuntu it was about 615 12% stale, in Ubuntu with a higher clock/memory about 650, with again 12% stale, and so this was just testing one card, but as soon as I plugged in a second or third card Windows would lock up with driver issues. Ubuntu/Xubuntu would have power issues. (with the 1000w) with the 850w I could see two fine in any OS, and could mine with both pulling 680 with 12% reject shares.

I was using 12.7, 12.8, 13.1 drivers, tried all three, 13.1 seems to be doing good right now. And for the SDK 2.8

Now for the issue of PCIe slots, all three of my 16x slots handle non powered and powered extenders fine. my 1x slots one and two are good, but the third one I think might need a presence short, it was being picky. As far as powered extenders go, I was planning to do something like all the 16x powered(three) and 1x (three) non powered. This should be ok I think, or do pcie 1x pull less power through the board and would benefit more from a powered extender? And or should I just power extend all 6 of them?

As far as cooling goes, I can keep any card at 680 hashing constant, and keep the card below 65c with fans at under 60% (Not bad right?  ) So cooling isn't an issue. I have an open rig design, custom aluminum rig that I build, all the cards spaced out and bolted in and elevated. Excellent air flow/cooling etc. So heat from the GPU's isn't an issue.

Now do you think a 1600w 80 plus gold psu the Lepa one, that should be able to handle x6 cards just fine. What OS would you recommend for the best hashing? I really enjoy Xubuntu and Ubuntu, I just need to be sure to get up there with the hash rate and low rejected shares. I'm mining a lot of new little scrypt coins on small pools so I thought maybe it was the pool? I threw in some settings into cgminer, scan time, query, and one more I forgot, combined with a lower intensity of 18 opposed to 20, that were able to push the rejected shares  down to close to 5% however I was only mining at 650 (this is in windows)

So what are recommendations on OS, PSU, pcie slots/extenders, drivers?   

I'm also very interested to learn more about how you got yours setup.  It's good to know that there might be some hope.

Yea I suspected it wouldn't be easy.  I have been having problems with my driver not being compatible with my zyxel 2.0 USB.  I'm getting a message that says" USB 2.0 non hi speed USB hub".  I'm trying to figure out how to download a driver and get my connection back on track.  Right now it is pitiful and when cellphones are around it gets pretty terrible. 

I've read that I need down download a program that will tell me what motherboard exactly I have and what I need to fix the problem as I understood it. This is all new to me and I'm trying to do more reading before I take task head on.  I read the Microsoft is dropping support for Win XP in 2014 and it was suggested that I get windows 8.  Today I saw mention of Windows 8.1 on the news so I have look into it so I can better understand my options. 

I would really like to start mining asap but with limited funds to get a rig setup and the trouble with Win XP leaves me in a bit of predicament.  I will try and get a handle on all this tomorrow and with any luck I'll be able to get a 7970 going.

why are you troling  
just so you know i dont have carpets in my comp room and its fake wood ontop of concrete

With a blunt knife.....

Take a product likely to catch on fire... put it in a highly inflammable petroleum product, finally stack it on a cotton carpet with a real wood floor underneath.....

that are 7950s i will have a look when i get a min

Are you running 7xxx cards?  It seemed that was my problem with XP.  There's no OpenCL support on the newer drivers for XP.  Moving to an old enough driver to get the OpenCL then did not have 7xxx support.