Okay, having PCIe doesn’t mean you’ll have SLI or Crossfire. While the DFI RD200X LanParty is out, there’s a lot of bugs, and isn’t suggested. The Asus A8R-MVP should be available soon, but even then, the current implementation of Crossfire isn’t quite up to par with nVidia’s SLI.
$400 is kinda tight, but let’s see what we can come up with for non-SLI and a budget SLI system.
Parts, all pricing off Newegg:
Fortron AX450-PN for $49.90 While I love my Enermax, Fortron is a good choice for quality on a budget. Dual 12V with 18A on each, so you should have enough juice to go with that. Now, if you want an SLI rig…well, that’s probably going to be a little tough with a $400 budget (but it can probably be done with 2 GeForce 6600’s and some inexpensive SLI board from ECS or Chaintech).
Motherboards:
On the low-end, you could go for this Chaintech VNF4 Ultra at $68, or
opt for the DFI LanParty NF4 Ultra-D for $128, pariticularly if a lot of tweaking is desired…provided you don’t have cheap-o DDR.
Now, if you want to go SLI, you can’t go wrong with the granddaddy SLI board, the Asus A8N-SLI for $122. This is the most mature SLI board out there, and probably your best choice. There are cheaper boards out there, but I’m unsure of some of the manufacturers or the good boards (like the ECS KN1 SLI) are too close in price to the A8N-SLI.
Video Cards:
Non-SLI:
Going with a $200 budget (splurge more on an GeForce 6800 if you spend less on the Motherboard and PSU), a Radeon X800GTO like this Power Color X800GT Xtreme 256MB unit would give a major kick in the pants.
If you want to flirt with SLI, you could go with a pair of eVGA GeForce 6600 256MB PCIe cards running at $104 each (the AOpen 6600 is cheaper at $99, but only features 128MB of RAM) If you wanted to go to a 6600GT, you could do that for a little extra. The card’s start about $125, depending on the maufacturer and RAM amounts, and most top out in price around $150-160.