PSU/8800GTX: Important Question

[AstralOrigin]

I'm receiving the Corsair HX 620W PSU and new eVGA 8800GTX tomorrow, but am unsure of exactly how to hook it up, due to being told that the GPU's connections should both run off the same rail.

There are two 6-pin PCI-e connections from the Corsair, so do I just use one of them and split the connection into the two connections on the GPU?

Or do I use both of the 6-pin connections, one for each on the GPU? - Which wouldn't make sense, because is you're running SLI, you'd need both of those to total four connections for both GPUs - so I'm assuming I should only run off one?

If so, neither the PSU or GPU come with any adapters to do that (that I've seen), so I'd have to get one separately.

I don't want to take the chance of either under-powering or frying the GPU (or PSU).

This may seem a "rudimentary" question, but I'm not really a PSU expert by any means in terms of certain technicalities, and new to nVidia's newer beastly cards.

Any immediate and informative help would be greatly appreciated.

 

[spaceman]

use both 6 pins bro. you will see. runs goood.

 

[AstralOrigin]

use both 6 pins bro. you will see. runs goood.

That would not make sense though, because if I was running SLI, I would need both 6-pin connections of the PSU.

Since there are four 4-pin connectors off the 8800GTX, should I just use 4-pin connections off the PSU?

 

[silent-circuit]

As I said elsewhere, if you're running SLI you should be using a PSU with 4 6-pin PCIe power connectors.