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Author Topic: Best mining card?  (Read 8771 times)
cmg5461
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June 07, 2012, 04:13:55 PM
 #21

if electricity is an issue, go FPGA

if not, 5970 is the best mhash/$.

5830 and 5850 are the best in terms of mhash/w.  7970 falls into this category too, but it is expensive in mh/$.

Although, I reccommend the 7970 if you game Cheesy (I have one and I love it Cheesy)

Umm what?

7970 and 5970 are king of MH/W. The 7970 will depreciate faster, but it is also less risk as its price is not primarily dependent on bitcoin mining profitability.

58xx are king of MH/$.

Nope, 58xx is best MH/J.  I mean, 5970 is TWO 5870's.  Just underclocked abd undervolted.  Underclocked and under volted 58xx gives much higher MH/J than the 5970.  (unless you're water cooling 5970's.  Thats an expection.)

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June 07, 2012, 04:15:27 PM
 #22

There is no easy answer, tt really depends on your priorities, i.e. cost of investment, warranty, power usage, slot availability, heat/environment concerns, etc.

If you could describe what you are trying to accomplish, it would be easier to give you a recommendation.

If you want a simple, this card is "best" I think you'll find that the 5870 and 5970 provide the best mix of cost/power/performance.

Don't get caught up in the game and have a nice day!
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June 07, 2012, 05:21:11 PM
 #23

320W for the one card?!

This sounds about right. The cards pull insane amount of power when you overclock them. This is a natural consequence of smaller process nodes resulting in larger leakages.
Exactly.

From my testing on seven of my own cards, the 7970's can take a healthy overclock with little overvolting up to around 1250MHz, but after that you just hit this wall where you need to pump a LOT of power into them to clock higher (>=1231mV). But honestly, the performance gain you get doesn't justify the power increase beyond that.

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June 07, 2012, 07:09:46 PM
 #24

Underclocked and under volted 58xx gives much higher MH/J than the 5970.  (unless you're water cooling 5970's.

Please provide evidence.

Not only are 5970 cherry-picked chips, the cores share the same PCB, which results in signficant gains in MH/J over 2x 5870.

Also, pick any MH/s you want and I garantee you a 7970 will beat the 5870 in terms of power consumption, no question about it.

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June 07, 2012, 07:11:28 PM
 #25

What is the best card for MH/$ and density ?

For MH/$ it is 5830s ? For density 5970s ?

What about 7970s and 7970x2s or reference 7990s ? 

I want to build a 30 ghash/s farm soon ...
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June 07, 2012, 07:22:33 PM
 #26

What is the best card for MH/$ and density ?

For MH/$ it is 5830s ? For density 5970s ?

What about 7970s and 7970x2s or reference 7990s ? 

I want to build a 30 ghash/s farm soon ...

I assume when you say density, you mean building rigs without using risers. In that case, the 6990 is the king of density.

I predict when the 7990s (and 7970x2) come out, they will completely dominate the MH/J if you underclock. I've gotten a 7970 down to about 270 MH/s and 10 MH/J... which matches BFL efficiency (but not MH/$)

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June 07, 2012, 07:33:07 PM
 #27

What is the best card for MH/$ and density ?

For MH/$ it is 5830s ? For density 5970s ?

What about 7970s and 7970x2s or reference 7990s ? 

I want to build a 30 ghash/s farm soon ...

I assume when you say density, you mean building rigs without using risers. In that case, the 6990 is the king of density.

I predict when the 7990s (and 7970x2) come out, they will completely dominate the MH/J if you underclock. I've gotten a 7970 down to about 270 MH/s and 10 MH/J... which matches BFL efficiency (but not MH/$)

How'd you do that? Can you post your core/mem/V/kill-a-watt numbers?

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June 07, 2012, 07:53:06 PM
 #28

How'd you do that? Can you post your core/mem/V/kill-a-watt numbers?

More than happy to:

My no-graphics card installed System Idle Power is 294W.

Using Afterburner I set my 3x 7970 system to the following:

Core Voltage: 825mV
Core Clock = 460 MHz
Memory Clock = 685 MHz
Memory Voltage = 1.5V <--- this doesnt seem to change my power consumption, so I doubt it is actually working in Afterburner. I include this here just for reference's sake.

My Kill-A-Watt reads: 380W. Minus the 294W for the system idle makes 86W for 3 cards.

Diablominer is showing 275 MH/s per card, so total of 825 MH/s.

825MH/s / 86W = 9.59 MH/J. Not exactly 10, but meh, close enough.

Anyways it is stupid to operate a graphics card this way pretty much anywhere. Net profit is maximized for me by running stock voltage @ 1200 MHz for 2.16GH/s @ 800W.


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June 07, 2012, 07:56:34 PM
 #29

My no-graphics card installed System Idle Power is 294W.

294W idle? Dude, there's something seriously wrong here ...

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June 07, 2012, 07:59:27 PM
 #30

My no-graphics card installed System Idle Power is 294W.

294W idle? Dude, there's something seriously wrong here ...

Look at sig dude. It's a 3930K @ 1.52V with 4 mechanical hard drives, 2 SSDs, and 50W in fans alone.

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June 07, 2012, 08:01:31 PM
 #31

My no-graphics card installed System Idle Power is 294W.

294W idle? Dude, there's something seriously wrong here ...

Look at sig dude. It's a 3930K @ 1.52V with 4 mechanical hard drives, 2 SSDs, and 50W in fans alone.

I was just about to say the same thing. That's still crazy high tho!

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June 07, 2012, 08:03:12 PM
 #32

Look at sig dude. It's a 3930K @ 1.52V with 4 mechanical hard drives, 2 SSDs, and 50W in fans alone.

~300W in idle is still too high imho.

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June 07, 2012, 08:05:14 PM
 #33

My no-graphics card installed System Idle Power is 294W.

294W idle? Dude, there's something seriously wrong here ...

Look at sig dude. It's a 3930K @ 1.52V with 4 mechanical hard drives, 2 SSDs, and 50W in fans alone.
Even with all that, at idle your drives shouldn't use more than 5W each, your SSDs more than 1W and your proc 40W (very pessimistic assuming heavy overclocking).
So this should make around 130W, maybe 150 or 160 assuming a power supply not horribly inefficient.
294W is just plain wrong.

The best I can get with a 7970 and a 80+ bronze power supply is around 4.5MH/J at 450MHz and 0.85V.

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June 07, 2012, 08:11:53 PM
 #34

It could be that one (or more) of his 7970's isn't downclocking at idle.  AMD didn't quite fix this with CCC 12.3 but did with 12.6 beta.
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June 07, 2012, 08:16:58 PM
 #35

It could be that one (or more) of his 7970's isn't downclocking at idle.  AMD didn't quite fix this with CCC 12.3 but did with 12.6 beta.

The idle numbers were taken with the PCI-E connectors pulled OUT of the computer.

Even with all that, at idle your drives shouldn't use more than 5W each,
Regular drives are close to 10W each

I have close to 90W just from cooling equipment alone. The water-pumps themselves are nominally 18W each, and 7W each for the fan.

Quote
The best I can get with a 7970 and a 80+ bronze power supply is around 4.5MH/J at 450MHz and 0.85V.

This is your system efficiency, not card efficiency.


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June 07, 2012, 08:19:05 PM
 #36

It could be that one (or more) of his 7970's isn't downclocking at idle.  AMD didn't quite fix this with CCC 12.3 but did with 12.6 beta.

The idle numbers were taken with the PCI-E connectors pulled OUT of the computer.


Each card can still pull up to 75W from the PCIe lanes. Only way to tell the true no-GPU idle is to remove the cards from the board.

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June 07, 2012, 08:19:27 PM
 #37

Your proc 40W (very pessimistic assuming heavy overclocking).

Have you ever overclocked a 3930K to 4.6 GHz before? Most of the time you have to turn off all the power-saving features. I assure you, it does not idle at 40W. Try 100+.

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June 07, 2012, 08:20:04 PM
 #38

It could be that one (or more) of his 7970's isn't downclocking at idle.  AMD didn't quite fix this with CCC 12.3 but did with 12.6 beta.

The idle numbers were taken with the PCI-E connectors pulled OUT of the computer.


Each card can still pull up to 75W from the PCIe lanes. Only way to tell the true no-GPU idle is to remove the cards from the board.

No, since they are non-functional and dont even attempt to negotiate a connection, they do not draw power from the PCIe lanes. I tested this myself.

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June 07, 2012, 10:38:14 PM
 #39

What is the best card for MH/$ and density ?

For MH/$ it is 5830s ? For density 5970s ?

What about 7970s and 7970x2s or reference 7990s ? 

I want to build a 30 ghash/s farm soon ...

I assume when you say density, you mean building rigs without using risers. In that case, the 6990 is the king of density.

I predict when the 7990s (and 7970x2) come out, they will completely dominate the MH/J if you underclock. I've gotten a 7970 down to about 270 MH/s and 10 MH/J... which matches BFL efficiency (but not MH/$)

Thanks for the explanation. It seems you have stolen D&T position as very knowledgeable person when it comes to mining.

I mean for space constrained people. I don't want to have to sell tons of stuff when mining stops being profitable ...

You have to use risers for good cooling anyway. Not like you can avoid them.
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June 07, 2012, 10:46:18 PM
 #40

What is the best card for MH/$ and density ?

For MH/$ it is 5830s ? For density 5970s ?

What about 7970s and 7970x2s or reference 7990s ? 

I want to build a 30 ghash/s farm soon ...

What is the best card for MH/$ and density ?

For MH/$ it is 5830s ? For density 5970s ?

What about 7970s and 7970x2s or reference 7990s ? 

I want to build a 30 ghash/s farm soon ...

I assume when you say density, you mean building rigs without using risers. In that case, the 6990 is the king of density.

I predict when the 7990s (and 7970x2) come out, they will completely dominate the MH/J if you underclock. I've gotten a 7970 down to about 270 MH/s and 10 MH/J... which matches BFL efficiency (but not MH/$)

Thanks for the explanation. It seems you have stolen D&T position as very knowledgeable person when it comes to mining.

I mean for space constrained people. I don't want to have to sell tons of stuff when mining stops being profitable ...

You have to use risers for good cooling anyway. Not like you can avoid them.





To stay on topic, I have a 5870 overclocked to 1200 mV and 950 MHz, I get ~425 Mh/s. It's great if you can get one used for cheap on eBay or Craigslist.

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