What is a pci express compliant power supply?(because i know you need one to run a pic express video card on a capable motherboard) and would this power supply handle it? Linkworld Technologies ATX-400W?

"(because i know you need one to run a pic express video card on a capable motherboard)"
Lol i meant pci express

you can run a pci express cards on a 20 pin ATX 1.0 or 24 pin ATX 2.0 power supply. It all depends upon what type of card it is and how Watts and amps are on a single 12 volt rail on ATX 1.0 power supply or double amps on a dual 12 volt ATX 2.0 power supply.

You have a few factors that you need to look at. Meaning is this going to be a powerful graphics card?

Are you wanting to get Sli graphic cards that needs an Sli Ready ATX 2.0 psu along with two pci xpress x16 slots?

For starters if your motherboard has a 24 pin power supply connection get a ATX 2.0 power supply with at least 14 amps on each 12 volt rail. if your motherboard has a 20 pin power supply connection get a ATX 1.0 that has at least 20 amps on a single volt rail. Now this is just for regualr grpahics card use if you are trying to install 2 grpahic sli cards you will need an Sli ready ATX 2.0 power supply. It will say that on the power supply if it is SLi ready or not. Those types of power supplies cost more then your avg power supplies.

As for watts I would get something in the range of at least 450 watts, but keep in mind watts don't mean that much if the amps on the 12 volt rail or rails are low on a ATX 1.0 power supply ATX 2.0 has a diff exception to that rule considering the amps on a dual 12 volt rail are split up in 2 parts.

AMD Athlon 64 X2 4600+ OC 2.7ghz
2GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 300gig 7200rpm 16mb cache RAID-0
Gigabyte Nforce 4 SLI

if all of that was confusing just look for a ATX 2.0 power supply that has at least 450 watts or higher and 14 amps or higher on each 12volt rail or look for a ATX power supply that has at least 450 watts or higher and 20 amps on a single 12 volt rail.

ATX 1.0 or ATX 2.0 power supply will all depend upon how many pins your motherboard power supply connection has on it.

ATX 1.0 has power supply 20 pins and ATX 2.0 power supply has 24 pins.

AMD Athlon 64 X2 4600+ OC 2.7ghz
2GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 300gig 7200rpm 16mb cache RAID-0
Gigabyte Nforce 4 SLI

You haven't given any details about your system, but how about this 500W PSU for free after rebate? It complies with ATX12V version 1.2, has a 20+4-pin main plug, & a single +12v rail with 28A.

http://shop2.outpost.com/product/45...

http://www.ultraproducts.com/produc...

For an ATX 2.0 motherboard, does this fit the bill as described above? I THINK I'm reading the specs right:

http://www.newegg.com/Product/Produ...