I just put a VisionTek ATI Radeon HD 3650 with a gig of RAM on the card into an older computer. The motherboard only has 1 gig of RAM and a single P4 at 2.53 ghz. I was pleasantly surprised with the performance. This is a relatively inexpensive card that can be bought at Best Buy for $120 or found online for under $100.

Installation was smooth and the driver that came with the card worked well with Realflight G4.

The other cards may work fine as well......I just know first hand that this one will.