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Author Topic: Would I be able to run a third card on my PSU?  (Read 1058 times)
pekv2
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June 16, 2012, 05:18:42 PM
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I am mining on 2 5850's atm on my PSU.

Would my psu be able to handle a third 5850 at mining?

This is my PSU.

60a rail, 750w (825W Peak).

http://www.pcpower.com/power-supply/silencer-750-quad-black.html

I am thinking in the future, I might add another 5850 if my psu could handle it.

What do you guys think?
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crazyates
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June 16, 2012, 05:37:12 PM
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Do you have a killawall? What's the draw from the wall with 2?

Also, are you undervolted? Undervolted 5850s only pull like 130W a piece, IIRC. So ya, you should be able to put a 3rd on there NP.

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pekv2
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June 16, 2012, 05:43:14 PM
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Do you have a killawall? What's the draw from the wall with 2?

Also, are you undervolted? Undervolted 5850s only pull like 130W a piece, IIRC. So ya, you should be able to put a 3rd on there NP.

I do not have a killawatt. One 5850 is 943/300 at 1.088v, the second 5850 is 1000/300  overvolted to 1.225v.

I will look into a killawatt in coming months. Getting a third card isn't something I am going jump on right away, kinda play the wait game see how those bfl jalapenos pan out to be.
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June 16, 2012, 06:14:20 PM
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Do you have a killawall? What's the draw from the wall with 2?

Also, are you undervolted? Undervolted 5850s only pull like 130W a piece, IIRC. So ya, you should be able to put a 3rd on there NP.

Well, it depends on how much you undervolt. At 0.95v, 5850s pull more like 90W.
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June 16, 2012, 10:16:30 PM
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One of my rigs has 3x 5850's, 920/450 (Core/Mem)  Stock volts.  550W at the wall.  I'd say you're going to be fine.
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June 16, 2012, 11:17:17 PM
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One of my rigs has 3x 5850's, 920/450 (Core/Mem)  Stock volts.  550W at the wall.  I'd say you're going to be fine.

I generally estimate 150w per 5850 (850-150-1.05 @ 352 MH)
50 watts for the MB

500 Watt total, 750W PSU would be fine. NICE single rail 12v power supply (I cant tell you how much time I have spent balancing multi rail 12V, on top of multiple power supplies)

You can pick up a Kill a watt meter really cheap, I just picked one up today at Menards for $14.57, my first one was like $25.00 at Ace hardware.



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June 17, 2012, 04:47:52 AM
 #7

One of my rigs has 3x 5850's, 920/450 (Core/Mem)  Stock volts.  550W at the wall.  I'd say you're going to be fine.

I generally estimate 150w per 5850 (850-150-1.05 @ 352 MH)
50 watts for the MB

500 Watt total, 750W PSU would be fine. NICE single rail 12v power supply (I cant tell you how much time I have spent balancing multi rail 12V, on top of multiple power supplies)

You can pick up a Kill a watt meter really cheap, I just picked one up today at Menards for $14.57, my first one was like $25.00 at Ace hardware.


I hear ya.  I refuse to waste my time on Multi-Rails.  XFX and Corsair Single Rails all the way.
pekv2
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June 17, 2012, 05:04:06 AM
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Kewl Cool. Now I know for future reference.
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June 17, 2012, 05:20:08 AM
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you shouldnt even have a problem running 4 5830's with that power supply as long as its a dedicated miner, at the very least you can run 4 at the 1.088 volt setting they use about 150 at stock 1.163 so you would be much lower than that
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June 17, 2012, 10:40:34 AM
 #10

I'm running 2 5850 stock volt/1015 core, 1 5870 0.95v, and 2 5830 0.95v and I'm drawing 740W at the wall with a HALE90 (80plus gold). Assuming 87% efficiency, thats about 644W DC current, still plenty of headroom on my PSU.

pekv2
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June 17, 2012, 11:40:02 AM
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I'm running 2 5850 stock volt/1015 core, 1 5870 0.95v, and 2 5830 0.95v and I'm drawing 740W at the wall with a HALE90 (80plus gold). Assuming 87% efficiency, thats about 644W DC current, still plenty of headroom on my PSU.

Wow, so basically, I could slap two more 5850's on my psu if not overvolted or overclocked. Even then a possibility a 5770. 5 cards all together, as my PSU is 825 peak.
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June 17, 2012, 02:59:36 PM
 #12

I have 5x 5850s @0.95v and pull 540 watts at the wall. 5850s are good for about 300-305 Mh/s at 0.95v. 
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