Powercolor AX5750-1GBD5-NS3DH is an excellent product from Powercolor. It is a low-profile graphics card with a heatsink and a 650MHz base clock speed. It is compatible with all 32-bit and 64-bit versions of Windows and is easy to install. The memory of this model consists of a DDR3 memory interface.
Note that this card can be used as a standalone video accelerator since it has an output for DVI, HDMI, and DisplayPort. It consumes 86 watts of power which means you do not have to worry about what to buy as far as electric power is concerned.