What to buy with $10K? | Bitcointalksearch.org

R-

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Quote from: discordian666 on April 05, 2012, 12:02:12 AM

Least till we see what the 7990's do later this month when they are released

http://www.fudzilla.com/home/item/26435-amd-hd-7990-specs-show-up

Quote

According to the post at INPAI, the upcoming HD 7990 features two 28nm GCN Tahiti XT chips, same one found on the HD 7970 graphics card. This means that we are looking at a card that will have 2048 stream processors and 3GB of memory per GPU. Appearently, these two Tahiti chips will end up clocked at 850MHz while memory will work at 1250MHz (5GHz effective).

I have high hopes as long as they are able to keep the chip efficient and cool.

discordian666

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Quote from: jamesg on April 04, 2012, 11:56:32 AM

Quote from: gnar1ta$ on April 04, 2012, 11:53:28 AM

Back on topic...what if we ignore electricity costs (I don't need a debate about right/wrong)? What rig would give the most Mhash/$, and is readily available?

7970s all the way.

Least till we see what the 7990's do later this month when they are released

silverbox

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Quote from: jamesg on April 04, 2012, 11:56:32 AM

Quote from: gnar1ta$ on April 04, 2012, 11:53:28 AM

Back on topic...what if we ignore electricity costs (I don't need a debate about right/wrong)? What rig would give the most Mhash/$, and is readily available?

7970s all the way.

Ditto.

jamesg

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Quote from: gnar1ta$ on April 04, 2012, 11:53:28 AM

Back on topic...what if we ignore electricity costs (I don't need a debate about right/wrong)? What rig would give the most Mhash/$, and is readily available?

7970s all the way.

gnar1ta$

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Back on topic...what if we ignore electricity costs (I don't need a debate about right/wrong)? What rig would give the most Mhash/$, and is readily available?

JusticeForYou

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https://bitcointalksearch.org/topic/looking-for-investor-bitcoin-backer-75017

notme

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Quote from: stcupp on April 03, 2012, 06:10:16 PM

Quote from: R- on April 03, 2012, 04:55:59 PM

Quote from: stcupp on April 03, 2012, 03:50:57 PM

Also you ever think maybe the long wait times are because they mine on your guys units for a month after they build them to get some extra profit Tongue

That might have been the cheekiest comment I've read on BCT.com

Think about it though gigavps claims he ordered "a couple" rig boxes they could have them built in a week then hold on to them and mine on them for a couple months and make a extra $4500 per rig box per month before they send them to him. Not saying BFL is doing this but its possible.

Quality control testing to ensure it operates smoothly...

stcupp

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Quote from: R- on April 03, 2012, 04:55:59 PM

Quote from: stcupp on April 03, 2012, 03:50:57 PM

Also you ever think maybe the long wait times are because they mine on your guys units for a month after they build them to get some extra profit Tongue

That might have been the cheekiest comment I've read on BCT.com

Think about it though gigavps claims he ordered "a couple" rig boxes they could have them built in a week then hold on to them and mine on them for a couple months and make a extra $4500 per rig box per month before they send them to him. Not saying BFL is doing this but its possible.

R-

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Quote from: stcupp on April 03, 2012, 03:50:57 PM

Also you ever think maybe the long wait times are because they mine on your guys units for a month after they build them to get some extra profit Tongue

That might have been the cheekiest comment I've read on BCT.com

stcupp

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Seems like we have all got off topic as well lol the question isnt What to buy with $15K? its What to buy with $10K?

I would say as long as you think bitcoin isn't going to totally collapse in the next couple years to go with FPGA's as they are more efficient and you will have a greater return in the long especially if you live in a area with high power costs. However, if your afraid bitcoin is going to anytime in the next couple years and dont mind less return then put your money into computer hardware and GPU's that will be a lot easier to resell if anything did happen.

Personally I would go with FPGA As others have said though there is a lot of things to consider when coming up with a payback period and profits and there is no way to precisely calculate it because all of the constantly changing variables. Such as price per BTC, Difficulty, changes in power costs, and cost of maintaining your hashing farm such as cooling, repairing fans, and anything else that could go wrong.

rjk

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Quote from: stcupp on April 03, 2012, 03:50:57 PM

but even with these more efficient chips...... How do you know that they will actually use the amount of power BFL says they will? If I'm not mistaken they said their singles were going to use only 40 watts in the beginning? maybe it was 60? theres no way of knowing what the actual power consumption is going to be until they get one built and test it.

Btw 1250 watts at 25 Gh/s sounds a whole lot like 125 spartan 6's =p but at 15k they would have to be getting them dirt cheap like $100 per spartan....

They have rejiggered the wattage claims since the singles have shipped. The initial claim was 800 watts at ~54 ghps, so the revised claims of 2500 watts at 50 ghps (or half that for the mini-rig) are likely to be closer to reality.

stcupp

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Quote from: jamesg on April 03, 2012, 01:07:01 PM

Quote from: stcupp on April 03, 2012, 01:04:20 PM

what makes you think BFL's mini rigs will really get 1250watts? if theyre using the same FPGA's as the singles it would be more like 2500 watts.

25000 ÷ 800 = 31.25 * 80 = 2500

as i recall they didnt have correct power consumption quotes on the singles either

This may be difficult to believe, but a little more reading and a little less typing would point you towards the correct answer.

The correct answer is that the mini rig uses more efficient chips.

sorry about that I wasn't home and was on a tablet Tongue

but even with these more efficient chips...... How do you know that they will actually use the amount of power BFL says they will? If I'm not mistaken they said their singles were going to use only 40 watts in the beginning? maybe it was 60? theres no way of knowing what the actual power consumption is going to be until they get one built and test it.

Btw 1250 watts at 25 Gh/s sounds a whole lot like 125 spartan 6's =p but at 15k they would have to be getting them dirt cheap like $100 per spartan....

Also you ever think maybe the long wait times are because they mine on your guys units for a month after they build them to get some extra profit Tongue

jamesg

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Quote from: gnar1ta$ on April 03, 2012, 03:09:36 PM

Don't forget expenses like electricity and internet can be business deductions when done properly.

I'm all over it. One of the best things anyone can do for themselves is run a business. The benefits are too numerous to list here.

Now back to the original topic.

gnar1ta$

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Quote from: nedbert9 on April 03, 2012, 03:03:29 PM

Quote from: jamesg on April 03, 2012, 02:22:31 PM

Quote from: nedbert9 on April 03, 2012, 02:09:07 PM

Quote from: jamesg on April 03, 2012, 12:16:45 PM

Quote from: matthewh3 on April 03, 2012, 12:00:12 PM

These new boards will take about a year to pay off.....

I sure hope you have double checked your calculations on that one. Payoff on a rig box is well before the subsidy halves for me at least.

I have a pretty well developed spreadsheet and I'm struggling to understand how you would be able to break even before Oct/Nov.

Magic?

6.6 months at current difficulty. This does not take into account depreciation and it's effects on my taxes at the end of the year, tax free money that comes out of the business because of the loans (from me to the business) to purchase the equipment. Other things also effect payback, like when you decide to sell your BTC.

Difficulty can go down too, which most people forget when it's going up. Just look at posts from the middle of last year when others were saying that they would be out of mining because of the exponential rise of difficulty. There are a lot of GPUs that are going to be unprofitable soon if the price keeps falling.

Ultimately, there are a lot of variables at play, but I feel I have done my homework and have put my money where it is best able to make a decent return.

Good tax tactic. I hadn't considered asset depreciation.

Your numbers are not too far off from mine, but I suppose I'm taking a conservative view on income. Thanks.

Don't forget expenses like electricity and internet can be business deductions when done properly.

nedbert9

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Quote from: jamesg on April 03, 2012, 02:22:31 PM

Quote from: nedbert9 on April 03, 2012, 02:09:07 PM

Quote from: jamesg on April 03, 2012, 12:16:45 PM

Quote from: matthewh3 on April 03, 2012, 12:00:12 PM

These new boards will take about a year to pay off.....

I sure hope you have double checked your calculations on that one. Payoff on a rig box is well before the subsidy halves for me at least.

I have a pretty well developed spreadsheet and I'm struggling to understand how you would be able to break even before Oct/Nov.

Magic?

6.6 months at current difficulty. This does not take into account depreciation and it's effects on my taxes at the end of the year, tax free money that comes out of the business because of the loans (from me to the business) to purchase the equipment. Other things also effect payback, like when you decide to sell your BTC.

Difficulty can go down too, which most people forget when it's going up. Just look at posts from the middle of last year when others were saying that they would be out of mining because of the exponential rise of difficulty. There are a lot of GPUs that are going to be unprofitable soon if the price keeps falling.

Ultimately, there are a lot of variables at play, but I feel I have done my homework and have put my money where it is best able to make a decent return.

Good tax tactic. I hadn't considered asset depreciation.

Your numbers are not too far off from mine, but I suppose I'm taking a conservative view on income. Thanks.

jamesg

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Quote from: nedbert9 on April 03, 2012, 02:09:07 PM

Quote from: jamesg on April 03, 2012, 12:16:45 PM

Quote from: matthewh3 on April 03, 2012, 12:00:12 PM

These new boards will take about a year to pay off.....

I sure hope you have double checked your calculations on that one. Payoff on a rig box is well before the subsidy halves for me at least.

I have a pretty well developed spreadsheet and I'm struggling to understand how you would be able to break even before Oct/Nov.

Magic?

6.6 months at current difficulty. This does not take into account depreciation and it's effects on my taxes at the end of the year, tax free money that comes out of the business because of the loans (from me to the business) to purchase the equipment. Other things also effect payback, like when you decide to sell your BTC.

Difficulty can go down too, which most people forget when it's going up. Just look at posts from the middle of last year when others were saying that they would be out of mining because of the exponential rise of difficulty. There are a lot of GPUs that are going to be unprofitable soon if the price keeps falling.

Ultimately, there are a lot of variables at play, but I feel I have done my homework and have put my money where it is best able to make a decent return.

nedbert9

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Quote from: jamesg on April 03, 2012, 12:16:45 PM

Quote from: matthewh3 on April 03, 2012, 12:00:12 PM

These new boards will take about a year to pay off.....

I sure hope you have double checked your calculations on that one. Payoff on a rig box is well before the subsidy halves for me at least.

I have a pretty well developed spreadsheet and I'm struggling to understand how you would be able to break even before Oct/Nov.

Magic?

jamesg

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Quote from: stcupp on April 03, 2012, 01:04:20 PM

what makes you think BFL's mini rigs will really get 1250watts? if theyre using the same FPGA's as the singles it would be more like 2500 watts.

25000 ÷ 800 = 31.25 * 80 = 2500

as i recall they didnt have correct power consumption quotes on the singles either

This may be difficult to believe, but a little more reading and a little less typing would point you towards the correct answer.

The correct answer is that the mini rig uses more efficient chips.

stcupp

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what makes you think BFL's mini rigs will really get 1250watts? if theyre using the same FPGA's as the singles it would be more like 2500 watts.

25000 ÷ 800 = 31.25 * 80 = 2500

as i recall they didnt have correct power consumption quotes on the singles either

EDIT: has BFL actually built one of these and taken power measurements yet?

jjiimm_64

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Quote from: gnar1ta$ on April 03, 2012, 12:52:45 PM

Quote from: jjiimm_64 on April 03, 2012, 12:40:50 PM

Quote from: gnar1ta$ on April 03, 2012, 11:51:16 AM

What about 7970's, can I get 6 of them on one rig with seasonic 1250 psu and a 890fxz GD65 or GD70 MB?

I have a little experience with this EXACT set up.

1. the seasonic will not push 6 of these cards unless you undervolt... alot
2. windoz will only load 5 of the 6 cards. i tried numerous times before falling back to the 5 per mobo approach.

http://s1027.photobucket.com/albums/y335/jjiimm_64/10x7970%20rig/

Good info. Can you fit 4 on the board without extenders? Would be like $2200/rig then. @2800Mh/s That's not horrible.

you can fit 4, but I would not advise it... these cards blow alot of air, and restricting airflow will heat them up...

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