Do you plan on overclocking your GT's? If so I'd suggest large exchanger, with high CFM fans, because two GT are going to dump LOADS of heat into your loop, especially if you plan on cooling the GDDR3 too. As it is, they're going to generate a fair amount of thermal energy even if you don't overclock them. Do you need specific suggestions? By nForce 4 do you mean the chipset?
Originally posted by: ssvegeta1010
I have heard that for SLI systems, DIY water cooling is the best way to go.
Personally, I would try to have 2 loops, one for the CPU and chipset, and another for the 2 6800GTs.
The nForce 3 and 4 chipsets aren't known to generate that much heat. The problem up until this point has been that no blocks were small enough to make plumbing them easy on an SLI rig. I THINK DD has a solution for this now, but so far only for the A8N SLI. Two loops would certainly add "WOW!" to the OP's rig, but it would also add a great deal of complexity for very little real gain in performance.
I personally would just have one loop... waste of money to have two... just make sure and get a nice big radiator and big resevoir... if you want to do two loops on a single water cooling system you could try getting this resevoir