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Bridging two 500w passive power supplies? - Page 2

post #11 of 23
3/25/12 at 2:22am
no bridging required, the video card first drains 75w from pcie slot (so whichever psu is connected to the motherboard) and another 75w from each 6 pin power connector or 150w from each 8 pin power connector, just distribute the drain between the PSUs
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post #12 of 23
3/25/12 at 2:48am
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Quote:
Originally Posted by FEAST View Post

Yes but the GPU's have to work harder.

doh.gif even if you just use one monitor with your cards, the power requirements will still be the same. it's not like your gpu will gonna be twice more powerful when you connected two monitors, or even 4.

furmark the cards with one monitor = 1x power consumption
furmark the cards with four monitors = 1x power consumption
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post #13 of 23
3/25/12 at 2:55am
Thread Starter 
Quote:
Originally Posted by ghostrider85 View Post

doh.gif even if you just use one monitor with your cards, the power requirements will still be the same. it's not like your gpu will gonna be twice more powerful when you connected two monitors, or even 4.
furmark the cards with one monitor = 1x power consumption
furmark the cards with four monitors = 1x power consumption

Yes but who runs furmark while using cpu power. Having multiple monitors on a card will put the memory clocks 10x higher and the core 3x higher at idle. So when I am stressing my cpu I will be using more power overall. Nobody every maxes their power consumption. But you do have a point the power will be similar under GPU load - which is never - for me.
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post #14 of 23
3/25/12 at 3:06am
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Quote:
Originally Posted by FEAST View Post

Yes but who runs furmark while using cpu power. Having multiple monitors on a card will put the memory clocks 10x higher and the core 3x higher at idle. So when I am stressing my cpu I will be using more power overall. Nobody every maxes their power consumption. But you do have a point the power will be similar under GPU load - which is never - for me.

the point is, if your power supply can provide enough power for the cards at full load using only one monitor, your power supply can also do that even if you use multiple monitors.

the full load of a gpu using a single monitor = the full load of a gpu using multi monitors
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post #15 of 23
3/25/12 at 4:15am
Quote:
Originally Posted by FEAST View Post

Quote:
Originally Posted by pioneerisloud View Post

You could, but its not recommended. Its usually better to use a single PSU.
Why do you need 1000w anyway? Your 6870 crossfire setup would work flawlessly off just one of those PSU's.

Not doing crossfire >> quad monitors.

Also, even with my overclock, 4 drives, and some pci hardware in the mix? That seems like a lot to run off of 500w?

Yes even then a good quality 500w is more than sufficient for your system. I can run GTX 580 SLI off my 650w. If I can do that, you can run HD6870 crossfire off a good quality 500w without worry.
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post #16 of 23
3/25/12 at 5:44am
There exist pcb to connect multiple PSU it was posted on this forum idk how was named
Edit: http://www.jab-tech.com/Bitspower-X-Station-Multi-PSU-Module-Blue-BP-XSU-BL-pr-4262.html found this and this http://www.overclock.net/t/14455/multiple-power-supply-guide
Edited by LukaTCE - 3/25/12 at 5:46am
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post #17 of 23
3/25/12 at 8:17am
A single good 500W unit is plenty for 6870 CFX, though I'd suggest getting a better unit that te NIghtjar 500... the Kingwin Stryker is cheaper and easily the best passive PSU on the market.
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post #18 of 23
3/25/12 at 8:31am
I dumped as close to your system as I could approximate (guess) here: http://extreme.outervision.com/PSUEngine

With OC'd CPU at 4.7, 2 6870s, 4 HDDs, 1SSD, 4 modules RAM, an optical drive, a few PCI-E cards, 4 case fans, 100% load on all components, it estimates ~730w power draw from your PSU. A single 850w PSU would suffice, but if you're fully loading everything at the same time (unlikely since you're not crossfiring--assuming only one card load at a time it would be ~625w full load).

You can probably better-approximate your system than I could, since I was just guessing.

Personally, I wouldn't chance bridging two 500w PSUs when a single slightly higher PSU (than 500w) would suffice.
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post #19 of 23
3/25/12 at 8:35am
Use this PSU Calc http://www.overclock.net/t/1140534/psu-calc-final-release
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post #20 of 23
3/25/12 at 8:38am
Like Unoriginal Sin said, the Stryker is very good: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=253
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