Quote from: jeremiahbuddha on July 10, 2011, 08:26:17 PM

bronze level certification for clean power recommended

80 PLUS Bronze is an efficiency rating. You can have a POS 80 PLUS power supply that has a noisy 12V rail or won't run multiple cards, or even one card in some cases.

Quote from: comnam90 on July 11, 2011, 04:59:56 AM

And as long as the PCIe 16x slot runs at atleast 4x then it will be enough to mine with

1x is even fine. Mining doesn't need much bandwidth to the card. (You can even use the physically smaller slots with adapters or modifications.)

The only considerations are physical compatibility, GPU-chipset compatibility (5000 and up cards won't run on nv chipsets), sufficient cooling, and a good power supply. If you are only going to run one GPU, you will probably be fine with either computer and there wouldn't be an advantage in either case, unless you are worried about power consumption.