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Is there a "proper" way to power a SLI config?

post #1 of 4
Thread Starter 
I have a Corsair 1000HX PSU sitting around, along with a pair of GTX 470s. The 1000HX is modular, but has a pigtail for 24-pin, EPS12V, and two PCI-E power connectors. It also has four more modular PCI-E connectors, two connections in 2 "banks", each on separate 12V rails.

The GTX 470s require 2x 6-pin PCI-E power connections, so I will need four of them in total. Should I...

A) Use the pigtail to power one card, and use both connections from Bank A, leaving Bank B empty (or vice versa)
B) Leave the pigtail alone, use Bank A to power one card, and Bank B to power the other
C) Use one lead from the pigtail to each card, then one lead from each bank to a separate card?

Or some other configuration?

I ask because, this PSU was from an RMA wherein the PSU died after about a year of powering these 470s. I got to wondering if maybe I had them 'powered' wrong.
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post #2 of 4

This PSU's specifications says that it comes with a total of six 6+2 PCI-E connectors.  So if you lost four of them and only have two left, then use those two, and then use four Molex connectors for the 2nd GTX 470.  These four molex cables will plug into two molex to PCI-E adapters that should have come with the 470s.

 

There is no other way to do it that would work correctly and safely.

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post #3 of 4
Quote:
Originally Posted by roleki View Post

I have a Corsair 1000HX PSU sitting around, along with a pair of GTX 470s. The 1000HX is modular, but has a pigtail for 24-pin, EPS12V, and two PCI-E power connectors. It also has four more modular PCI-E connectors, two connections in 2 "banks", each on separate 12V rails.
The GTX 470s require 2x 6-pin PCI-E power connections, so I will need four of them in total. Should I...
A) Use the pigtail to power one card, and use both connections from Bank A, leaving Bank B empty (or vice versa)
B) Leave the pigtail alone, use Bank A to power one card, and Bank B to power the other
C) Use one lead from the pigtail to each card, then one lead from each bank to a separate card?
Or some other configuration?
I ask because, this PSU was from an RMA wherein the PSU died after about a year of powering these 470s. I got to wondering if maybe I had them 'powered' wrong.

I'm powering mine with the pre-attached connectors and the blue modular 12V1 connectors.
Here's a thread with a wiring diagram for the HX1000, depending on how much power your CPU draws you might be better off with the second pair of connectors attached to the 12V2 instead.
Chances are if you're overclocking the cards the way I have it is better because the cards are probably the most demanding thing in your system so splitting them between the two rails is a good idea.

Edit: To explain the rails, a HX1000 is basically two separate 500W PSUs inside one casing that have been designed to work together. This means you should balance your load across the two rails to avoid overloading one of the two 500W units.
Edited by Mike-IRL - 10/17/12 at 1:24am
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Seagate NAS 240GB m500s RAID 0 MCP 350 w/ res top >> MCP655 >> Heatkiller full... Windows 8.1 
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MouseMouse PadAudioAudio
G402 / Deathadder 2K13 League of legends one, cloth ODAC >> O2 >> HD800 / K702s Samson mediaone 5as 
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post #4 of 4
Thread Starter 
That's good info; as a fairly-dumb fellow, the illustration from that link helped me a ton.
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CoolingOSPowerCase
RR-B10-212P-G1 FQC-06950 SSR-450RM Fractal Define Mini 
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Cen2
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WD30000FYYZ WD30000FYYZ WD30000FYYZ WH14NS40 
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RR-B10-212P-G1 FQC-06950 SSR-450RM Fractal Define Mini 
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