The lower voltage really helps the 5970 keep the power usage down since switching power use rises exponentially with the voltage. I really want to see what a 7990 with cherry-picked chips can do...
+1. I may ditch my 5970s when the 7990s finally come out. |
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You must have missed this then. Unless you consider 50W per card not a significant power savings. cgminer @ 0.95V/600/150, 273W, 542Mh/s I'm not sure why Art was running his at 950mv since all of my 5970s will do 899mv/610/150, ~232W (at the wall), 554 MH/s. |
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Where are you shipping from?
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No, but you can get a PCI to PCIe adapter that works fine... then you can run PCIe cards in your PCI slots.
I couldn't find any on Cablesaurus.com. Got a source for these? |
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Yay for 4M+ blocks  |
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170W is really good for that many cards. What other components are you using? CPU/memory/drive?
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Switched out the 5870 I had in my best rig since it couldn't do below 0.95V and I wanted to test even lower. 6xSapphire 5850 Xtreme@0,906V 620-650Mhz HX850 80+ silver 1550MH/S, 464W at the wall, 3,34MH/W This is where it becomes less profitable for me to undervolt, but damn are these cards cool. Running them with fans on auto (30-35% fan speed) and they wont go above 60C with a room temp of 25C  Why didn't I buy a 100 of these cards rather than 10 back in may last year  Damn, that's really good. What is your power draw at idle before you start mining? |
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VDDC: 0.9000 V
VDDC Current: 32.0-34.0 A
28W*2 for 550 MH/s? That's 19 9.5 MH/J, which is FPGA efficiency. Are you sure that's not idle? That's what it says on GPU-Z. Actually, switching between cards (I didn't notice I could do that), I see some of the GPUs are at 37.5A. Edit: And yeah, that's at roughly 277 MH/s per core. |
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VDDC: 0.9000 V
VDDC Current: 32.0-34.0 A
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Here's what my numbers look like
315W idle at desktop
Clocks 925/685
1100 MH/s (2 GPUs, I took one of my cards out), 550MH/s per card just like yours.
0.950 VCore
460W load.
460-315 = 145W
Divide by 2 for 2 cards = 72.5W
550 MH/s / 72.5W = 7.5 MH/J.
Edit: I wonder if Roadhog disabled ULPS that would explain the low efficiency numbers. If he didnt, the numbers are not comparable to 5970 since 5970 idles at 42W idle power while the 7970 is 15W for the first card and 3W for each additional card.
Anyways, I think a more fair metric would be "System idle power without graphics card installed". That would lead to better numbers. Then again at that point, you may end up with inaccuracies due to PSU efficiency since for a 1200W PSU, you're approaching the 10% load which is something usually 70-75% efficiency on an 80PLUS Gold unit.
Edit2: Maybe it is best if we compared via GPU-Z? (VDDC Current * VDDC) should give us correct power. Which in my case would be 550MH/s / 75W = 7.3 MH/J
315W at idle is curiously high. In fact that idle number is getting close to what my gaming rig pulls when mining with dual 5970s (1100 MH/s @ ~360W ~382W). You're pulling 100W almost 80W more than I am at the exact same hash rate. 7970s should very closely approach 5970s for efficiency when downvolted, so I'm assuming there's still some room to streamline for power consumption on your system? |
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You really expect your 40nm GPU to actually even come close to a 28 nm GPU in terms of power efficiency? I mean yes we gained a bunch of scheduler hardware, but we're actually 1.5 nodes away from 40 nm (since TSMC cancelled their 32 nm node). For efficiency result, look no further than here: https://bitcointalk.org/index.php?topic=57410.msg683755#msg683755That guy is pulling over 4 MH/J (1650 MH/400W) on air, more than 5 MH/j on water. I really had no expectations, but the results were really surprising. If you read through the thread, you'd see I posted as well so I'm aware of Roadhog's findings. Where's he's doing 5.04 MH/j per card on water, I'm doing over 5.67 MH/j per card on air with my 5970 setup. 97w load while mining (135W idle at the plug, 232W while mining) 550 MH/s. Same formula Roadhog used, so it eliminates variables like CPU and other accessories that might add to the system total. |
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The highest clocked 5970 on the wiki did 863.4 MH/s and it is likely with watercooling and overvolting. Since there are so many of those cards, I would assume that's a fairly high result amongst 5970s. However when I looked at the 7970s, most didn't bother seriously overvolting their hardware. lol watercooling, srsly? I can hit 860 MH/s+ with an overvolt/overclock on my 5970s, and I think my cards are average. The problem with running them that hard is they guzzle power like crazy. During the day I run mine a little undervolted/underclocked to save on power. 3x 5970 Rig idle: 228w Rig mining: 541w 1.67 GH/s
3.08 MH/jBut that's with a Athlon II x4 960t processor. I could probably trim out a few more watts by going with an AMD Sempron or something. I'm curious to see how much more efficient your 7970s are. |
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I think you mean the 5970.
In that case, the power efficiency of the 7970 will allow for an earlier break-even point if you pay a relatively normal price for electricity.
Of course if power is free, the 7970 is a much better overclocker and usually exceed overclocked 5970 speeds and so wins on that front too.
So you're saying a 7970 can hit over 850 MH/s? |
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Can you pick your own login name/pw, or are they pre-generated?
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Ok so I signed up to GPUMax... is there like a waiting list to get in or something?
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lol I'd hate to see your electricity bill  |
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Geez, amazingrando... What kind of hardware are you running?
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Is it stable enough to re-enable merged mining?
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$600 per rig plus shipping. That's what it costs me to build a 1.2GH rig.
You can't buy 1.2GH/s worth of cards for $600 Maybe not new (well, not since BensOutlet.com's $140 for brand new 5870s), but anything goes on the used market. |
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