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del
July 06, 2011, 02:56:10 PM
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July 07, 2011, 01:37:28 PM
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nice! I was wondering how that works, now I know what to get in case I'll ever need it

lost link to separate dedicated power for gpus  that was in a range of $25 that I sow a while ago in one of the threads.
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July 07, 2011, 10:00:56 PM
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I'm all about connecting the green and blacks with duct electrical tape method.  Any spare bit of wire will do, and you can stack 'em up ad-infinitum Wink

Just my 2 cents, which happens to be what I'm willing to spend on that  Grin

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July 08, 2011, 09:19:21 PM
 #4

You really have two options, either connect the green and black wires on the second PSU and have the power on all the time(i.e. you use the switch on the PSU to stop the GPU fans from spinning at 100% while the computer is turned off) or combine them with the green and black from the first PSU and into the motherboard, like that adapter does..

If you know what you are doing you could use a MOSFET switch and hook the second PSU up to a fan but that's a little overkill when you can connect it to the other PSU directly =P
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July 09, 2011, 05:15:00 AM
 #5

Thank you!
Never knew these things existed.

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July 09, 2011, 05:38:23 AM
 #6

Nice if you have 2 PSU around or if you need more than 1500W on your rig, but honestly buying a single good PSU saves you more bucks in the mid time. A stock PSU has an efficiency that rarely reach 70% (that's means that you consume 100W for every 70 used, or 1000W for every 700). A good PSU will consume less than 800W giving you 700W. In a year of mining that's saves you more than 1700KWh/yr or 300$.

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July 09, 2011, 02:40:13 PM
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yes but for example a AX1200 is way to expensive whit 60% of them money you buy 2 HX650

Quite true, but you're talking of 2 PSU different, and anyway with the 2 PSU used at 1200W you consume 1900KWh/yr (or 285$/yr) more than using the single AX1200. Over that, I don't know where you live, but here a HX650 costs 110€ and a AX1200 230€ only 10€ of difference.

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July 09, 2011, 08:11:20 PM
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i have 1 motherboard whit 3 cards, 2 cards 620w psu, and 1 card 300w psu.

24/7 Wink
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July 09, 2011, 08:42:16 PM
 #9

can you give a link where to see this calculations

Sure, for the Corsair PSU check the specs on their site:

AX1200


BX650


The calculation is really simple

Absorbed W = Watt/Efficency

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July 09, 2011, 09:20:26 PM
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yes but for example a AX1200 is way to expensive whit 60% of them money you buy 2 HX650

Quite true, but you're talking of 2 PSU different, and anyway with the 2 PSU used at 1200W you consume 1900KWh/yr (or 285$/yr) more than using the single AX1200. Over that, I don't know where you live, but here a HX650 costs 110€ and a AX1200 230€ only 10€ of difference.

i dont know where you live but where i live 230-110=120
 Grin

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July 09, 2011, 09:26:11 PM
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i dont know where you live but where i live 230-110=120
 Grin
Ehm: 2X110 = 220

230 - 220 = 10

 Wink

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July 09, 2011, 11:45:33 PM
 #12

Thanks for the info. I will buy one now that I know it is possible without me having to do some re-wiring.

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July 10, 2011, 06:17:07 AM
 #13

hmm then what PSU can i get for less that 130€ and to tank 5x5850

No one, 5X5850 requires 750W on 12V line to work, plus the disk, motherboard and CPU requirements. You need at least a good 1000W PSU or If you already have a PSU in you PC, you can add a good 650-750 one, Check also that you have enough cables to power up the cards: 5x5850= 10 6 pin power connectors. Try to don't  use more than 1 6 pin for molex  adapter also, the molex is rated up to 8A max, the 6 pin brings 6,3A each.

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July 10, 2011, 07:26:41 PM
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hmm then what PSU can i get for less that 130€ and to tank 5x5850

No one, 5X5850 requires 750W on 12V line to work, plus the disk, motherboard and CPU requirements. You need at least a good 1000W PSU or If you already have a PSU in you PC, you can add a good 650-750 one, Check also that you have enough cables to power up the cards: 5x5850= 10 6 pin power connectors. Try to don't  use more than 1 6 pin for molex  adapter also, the molex is rated up to 8A max, the 6 pin brings 6,3A each.
i was thinking at Xilence SPS-XP1000.CS.R3

It's a nice PSU, but be warned that you have 3 12V rails so you can't charge more then 384W for line.

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