Upgrading Video card what will work?

[Guest]

I have a 1.86 ghz core 2 duo processor, 3gb ram, 650 psu and the motherboard uses PCI express 16 slot. Are there any limitations on what graphics card I can get as an upgrade. I am looking at nvidia geforce 250 gts or a nvidia geforce 275 gtx?

 

[outlw6669]

Nope, both of those cards should work just fine in your rig.

 

[Guest]

I have 3 gb ddr2 ram(32 bit vista), the chipset is an Intel Core 2 Duo 1.86, gateway brand computer. Not sure on the motherboard yet, but like I said it does have pci express slot. The psu brand is antec. I am not that knowledgeable about over clocking the cpu, I wouldn't know what to do or where to start.