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Need a little help with hookup

1Wolf

1Wolf

Limp Gawd
Joined
Jul 10, 2007
Messages
439
I've got a thermaltake Toughpower 1200W PSU and just picked up a GTX 295. The GTX295 wants 46amps on the 12v Rail.

I'm looking at the manual for my PSU and I'm not exactly sure how to cable it for the new PSU.

There are 4 12v Rails on the PSU.

Here is a pic of the configuration:
http://www.newegg.com/Product/ShowI...maltake Toughpower W0133RU 1200W Power Supply

The manual suggests that if you have a video card that needs two power cables...to feed them both off the same 12v Rail.

There are 2 6-pin connections and 1 8-pin connections on 12v3
There is 1 6-pin and 2 8-pin connections on 12v4

The info in the grid on the PSU states that 12v3 is 36amp and 12v4 is 36amp.

So should I connect BOTH the video cards power sockets to either 12v3 or 12v4 like the PSU manual states....however it seems (although I'm sure I'm not understanding this correctly) that would mean I'm only getting 36amps and the video card wants 46amps.

Or...

Should I connect one power lead to 12v3 and the other to 12v4 and my 12v rails will be the 'total' of the two cables thus giving me 36amps plus 36amps.

I apologize in advance if my question is confusing....I'm a bit confused by this whole thing.

Thanks!
 
Dude, the 46A rating is for the entire system + GPU. You can power them off either the 12v4 or 12v3. 36A is more than enough for the GTX 295.
 
Thanks Danny,

I was hoping you'd see that post, pop in, and lend me a hand.

Thankyou so much :)

I was surprised when I bought the thing and it said 46amps on the side of the box. PSU's, multiple rails, and all that are still pretty confusing to me. But I'm learning :)

Thanks again!
 
The Toughpower 1200W is a CWT PUC PSU, which has two +12V rails which probably has the same distribution as the Corsair HX1000 which you can see here: http://forum.corsair.com/v3/showthread.php?t=70317

As you can see, the two hard-wired PCI-E power cables are on +12V2, and the modular ones are on +12V1. If you want to power your card off of a single rail, then just use either both hard-wired cables or both modular ones to power your card.
 
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