staraptor (OP)
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July 07, 2011, 02:05:12 AM |
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Could you guys with 4 cards in one sys post your power draw at the wall along with what cards you have
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In order to get the maximum amount of activity points possible, you just need to post once per day on average. Skipping days is OK as long as you maintain the average.
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jme621
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July 07, 2011, 02:37:33 AM |
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Could you guys with 4 cards in one sys post your power draw at the wall along with what cards you have
which cards?
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faille
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July 07, 2011, 02:44:52 AM |
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4 x 6950 on an i5 2500k = 820 from the wall
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trentzb
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July 07, 2011, 02:56:58 AM |
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4 x 5850 on Sempron = 620W at wall / 1400 Mh/s
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sethmo
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July 07, 2011, 03:36:16 AM |
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4 x 5850 on Sempron = 620W at wall / 1400 Mh/s
Cool, I will have two setups of 4 5830s on Corsair 750psu, was worried that I would be getting close to the limit of my psu. Should be good
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trentzb
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July 07, 2011, 05:22:08 AM |
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Careful, those numbers are not stock. Highly tweaked. Same rig not tuned running ~350 Mh/s pulls closer to ~800W at wall. 5830s usually pull a bit more than 5850s.
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faille
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July 07, 2011, 05:58:36 AM |
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don't forget to factor in your PSU efficiency, and try to leave a little headroom on top if you can.
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newunit16
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July 07, 2011, 12:32:21 PM |
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i run a 4x 5830 rig, sempron 1ram module, hdd. 2x power supplies feeding it all. 620w and a 530w. both 80%+ certified 740 max watts from the wall.
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Fletch
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I'll have a steak sandwich and a... steak sandwich
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July 07, 2011, 08:43:09 PM |
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4 x 5850 on Sempron = 620W at wall / 1400 Mh/s
Seems about right. I'm running 3 x 5850 on Sempron and I measure about 480-490 W. I have a 600W 80+ Gold PSU (effeciency 540W) so there's a bit of headroom, but not a lot.
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newunit16
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July 08, 2011, 12:02:44 AM |
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I have a 600W 80+ Gold PSU (effeciency 540W) so there's a bit of headroom, but not a lot.
people seem to read efficiency wrong. if you have a 1000w power supply rated at 80% efficient, it doesn't allow 800w. it allows 1000w, but it will draw 1250w from the wall. 1250w at 80% is 1000w. you get the power advertised, but the power supply will use X% more, where X is 100-efficiency rating. another note, peak efficiency is usually around 20-75% load on the power supply.
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blackgold
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July 09, 2011, 10:42:31 PM |
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Unit is correct. When reading a power supplies rated efficiency such as 80, 85.. whatever is not shown i.e 100-80=20% is what is lost in the conversion from wall power to make the power... So if your power supply can deliver 1000w @ 80%, then the power from the wall must be 20% greater to make up for loss.
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johnyj
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Beyond Imagination
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July 18, 2011, 03:14:55 AM |
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I don't really understand Is this mean, if I measured 500W at the wall, the PSU only output 400W to supply the whole machine?
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macharborguy
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July 18, 2011, 03:22:29 AM |
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I have a 600W 80+ Gold PSU (effeciency 540W) so there's a bit of headroom, but not a lot.
people seem to read efficiency wrong. if you have a 1000w power supply rated at 80% efficient, it doesn't allow 800w. it allows 1000w, but it will draw 1250w from the wall. 1250w at 80% is 1000w. you get the power advertised, but the power supply will use X% more, where X is 100-efficiency rating. another note, peak efficiency is usually around 20-75% load on the power supply. good to know, but also reading it wrong is beneficial in a way, since they aren't pushing the PSU as hard as they could be.
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vapourminer
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what is this "brake pedal" you speak of?
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July 18, 2011, 10:46:16 AM |
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I don't really understand Is this mean, if I measured 500W at the wall, the PSU only output 400W to supply the whole machine? at 80% efficiency, yes. power supplies have "sweet spots" on their efficiency curve, the manufacturer should have a chart. one may peak at 50-80 % load, another at 75-85% load. they vary. but 80+ certified means it will never be below 80% no matter what the load.
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haploid23
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July 18, 2011, 06:25:24 PM |
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my highest outputting rigs has 3x 5850 and 1x 5870, all overclocked, draws about 750w from the wall using a 850w gold efficiency PSU
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Morebitcoinsplease
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July 19, 2011, 06:00:55 PM |
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I haven't got the readings but I pull straight from the wall several rigs with UPS battery backup
One setup I have is
(1) Wall Jack handles 7 GPU Cores 1200w PSU with 1x5850 3x5970's
The other is
(1) Wall Jack handles 4 GPU Cores 1200w PSU with 4x5850's
So you should be good pulling from the wall I know I can put 8 GPU Cores on one wall socket on a 1200w PSU
But keeping in mind those rigs are the only items on that entire circuit, I don't plug anything else in them.
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teukon
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July 19, 2011, 10:20:23 PM |
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Unit is correct. When reading a power supplies rated efficiency such as 80, 85.. whatever is not shown i.e 100-80=20% is what is lost in the conversion from wall power to make the power... So if your power supply can deliver 1000w @ 80%, then the power from the wall must be 20% greater to make up for loss.
Wouldn't the draw at the wall be 25% greater? If a PSU draws 1250W from the wall and is 80% efficient then it is supplying 1250W * 80% = 1000W to the miner. Honestly I don't know what the efficiency rating on the PSU means but if by 80% they mean that only 80% of the power it receives is passed on then the draw at wall would have to be 1250W.
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trentzb
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July 19, 2011, 11:07:51 PM |
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Honestly I don't know what the efficiency rating on the PSU means but if by 80% they mean that only 80% of the power it receives is passed on then the draw at wall would have to be 1250W.
Yep, this is what is means.
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malavita
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July 20, 2011, 06:42:49 PM |
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Does anybody know total power consumption for 5 X 6970 - just cards, not PC obviously.
Thx!!!
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cicada
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July 20, 2011, 06:52:01 PM |
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Does anybody know total power consumption for 5 X 6970 - just cards, not PC obviously.
Thx!!!
I can estimate it for you - 6970's pull ~160-200W, so 5x would be somewhere between 800 - 1000W Google + simple math = your friend. [edit][disclaimer] I don't own these cards (I do own 6950s with similar draw), and this is not taking OC into consideration.
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Team Epic!All your bitcoin are belong to 19mScWkZxACv215AN1wosNNQ54pCQi3iB7
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