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Author Topic: Will this 1000w PS be good for 4 5850's?  (Read 1255 times)
tatsuchan
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June 05, 2012, 11:55:44 PM
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http://www.newegg.com/Product/Product.aspx?Item=N82E16817517008

Looking at buying this for a 4 5850 or possibly a mix of 5850 and 5830 rig.  Think it will be okay?  Any PowerSupply Experts here to help?
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MrTeal
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June 06, 2012, 12:08:45 AM
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1000W is plenty for 4 5850s, but that one is a little sketchy. The OEM is Super Flower, so it could go either way. Only 4 PCIe cables means you'll need 4 Molex to PCIe cables. It's single rail so it will probably work fine, but you might want to spring for a better one if you can afford it.
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June 06, 2012, 12:16:11 AM
 #3

The 5850's really only consume about 150w under full load (at the wall).  So, theoretically, you only need 4x150 + say, 50w for the CPU/motherboard idling.  650w, + 20% for some headroom = 780w.  This PSU would be a MUCH better option than that 1000w you have listed, even though it's only 800w.  http://www.newegg.com/Product/Product.aspx?Item=N82E16817139025

That 1000w looks like the type that would only run 600w before keeling over.
Coinoisseur
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June 06, 2012, 12:48:13 AM
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I'd suggest a 850-900W unit, just not comfortable with edging too close to the maximum rating. Besides running at max load can knock a few percent off efficiency.
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June 06, 2012, 12:51:37 AM
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I'd suggest a 850-900W unit, just not comfortable with edging too close to the maximum rating. Besides running at max load can knock a few percent off efficiency.
800w is more than 20% above the estimate current draw... how much headroom do you want???
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June 06, 2012, 01:14:46 AM
 #6

50 more watts.
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June 06, 2012, 01:57:12 AM
 #7

It's actually a lot more margin than that, as PSUs are rated by their DC output and not what they pull from the wall. A good 800W supply would power those cards without problem; the rig I have my KillAWatt plugged into right now is drawing 330W at the wall with an 80+Bronze supply with two unlocked 6950s at 850/200 which would draw as much or more than a pair of 5830s.
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June 06, 2012, 05:29:32 AM
 #8

With all 4 cards and the board at idle it will consume 160w at the wall, approximately. When mining, OC engine 860 and UC memory 220, draw will be 680-700w at the wall.
Would be best if you chose a single rail PSU and 750w would be a minimum. How efficient a PSU you should get just depends on how much you want to spend, the more efficient the more it will cost.

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abbeytim
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June 06, 2012, 07:16:30 AM
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also remember when underclocking ram it consumes a little less but your probably ocing the core 2
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June 06, 2012, 07:19:32 AM
 #10

http://www.newegg.com/Product/Product.aspx?Item=N82E16817256058

nice silverstone with a single rail  Smiley
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June 06, 2012, 07:22:42 AM
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http://www.newegg.com/Product/Product.aspx?Item=N82E16817139029

heres a corsair with a single rail
fuxianhui888
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June 06, 2012, 07:46:37 AM
 #12

850w is good enough
tatsuchan
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June 06, 2012, 12:26:38 PM
 #13

Thanks for the replies guys!

So make sure it is single rail, and you guys ARE NOT willing to risk non-name brand power supplies, correct?  Even with bronze ratings/single rail?

Also, think a windows 7 machine, single core cpu, 2GB RAM, 1000Watt PSU could run 5 5850 cards?Huh (don't know if it changes somehow at 5, cause I don't see anything over 4 much)  I have a friend with free electric, but they are only able/willing to allow me to run 2 nodes.  Wanna get the best bang for buck, but don't have much money.
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June 06, 2012, 12:38:42 PM
 #14

I'd get this

http://www.amazon.com/PC-Power-Cooling-Performance-compatible/dp/B003U29C40/ref=sr_1_1?s=pc&ie=UTF8&qid=1338985544&sr=1-1

At 950w, it's more than you need, yes, but leaves room for future expansion. And at $120 after rebate, it makes the "upgrade" very affordable. I have one of these and it rocks. One thing to keep in mind, though, is that it's not modular. But with four GPUs you are going to use most of the cables anyway, so I don't think it matters much.
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June 06, 2012, 12:48:35 PM
 #15

Thanks for the replies guys!

So make sure it is single rail, and you guys ARE NOT willing to risk non-name brand power supplies, correct?  Even with bronze ratings/single rail?

Also, think a windows 7 machine, single core cpu, 2GB RAM, 1000Watt PSU could run 5 5850 cards?Huh (don't know if it changes somehow at 5, cause I don't see anything over 4 much)  I have a friend with free electric, but they are only able/willing to allow me to run 2 nodes.  Wanna get the best bang for buck, but don't have much money.

The bottom line is that you want to get a *good* PSU. You probably can run 5 5850s off a good 1000w PSU, but you have to get a good one. A good PSU can run 70-80% of its rated load 24/7, but not a mediocre one. Also, keep in mind that you can undervolt. I'm running 5 5850s now @0.95v. I'm getting a little over 300 Mh/s per card and pulling 540 watts at the wall. If you undervolt, you can get by with this

http://www.amazon.com/PC-Power-Cooling-Performance-compatible/dp/B003U29C3Q/ref=sr_1_2?s=pc&ie=UTF8&qid=1338985544&sr=1-2

I'm recommending the PC Power and Cooling PSUs b/c they offer great bang for the buck.
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June 06, 2012, 03:54:39 PM
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Thanks for the replies guys!

So make sure it is single rail, and you guys ARE NOT willing to risk non-name brand power supplies, correct?  Even with bronze ratings/single rail?

Also, think a windows 7 machine, single core cpu, 2GB RAM, 1000Watt PSU could run 5 5850 cards?Huh (don't know if it changes somehow at 5, cause I don't see anything over 4 much)  I have a friend with free electric, but they are only able/willing to allow me to run 2 nodes.  Wanna get the best bang for buck, but don't have much money.

The bottom line is that you want to get a *good* PSU. You probably can run 5 5850s off a good 1000w PSU, but you have to get a good one. A good PSU can run 70-80% of its rated load 24/7, but not a mediocre one. Also, keep in mind that you can undervolt. I'm running 5 5850s now @0.95v. I'm getting a little over 300 Mh/s per card and pulling 540 watts at the wall. If you undervolt, you can get by with this

http://www.amazon.com/PC-Power-Cooling-Performance-compatible/dp/B003U29C3Q/ref=sr_1_2?s=pc&ie=UTF8&qid=1338985544&sr=1-2

I'm recommending the PC Power and Cooling PSUs b/c they offer great bang for the buck.
A good PSU can run 100% of its rated load 24/7.  A mediocre one can run 80%, and a really terrible one can run maybe 50-60% before dying on the spot.
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June 06, 2012, 05:42:43 PM
 #17

There is nothing wrong with super flower. I use a 650W silver rated unit for my two 5850s. 6 months 24/7 use and not a single issue. Would buy again but in gold or platin  Tongue

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June 06, 2012, 05:56:42 PM
 #18

1000W is plenty for 4 5850s, but that one is a little sketchy. The OEM is Super Flower, so it could go either way. Only 4 PCIe cables means you'll need 4 Molex to PCIe cables. It's single rail so it will probably work fine, but you might want to spring for a better one if you can afford it.

I'm using Super Flower PSUs and they have been working great so far. Right now I have 4x5870 + 7970 plugged to a 1000W Super Flower PSU. Cards are undervolted and the whole system is just under 600W.
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