Installed on XP without issue (2GB RAM with Core 2 Qaud processor). It requires 2 slots so had to rejig the insides of my machine as my PCI Express cards were side by side.
First impressions after setting BioShock, Left4Dead, DeadSpace and HL2 Ep 2 to maximum options is exceptional. Frame rates are very high (maintains 60Hz easily) and it is stable at 1280x1024. Not tried over-clocking but this is also an option.
When I finally get Windows 7 installed (been delayed due to the install process being a complete wipe and I don't have the time to start from scratch this month) I will see how DX11 looks on this card.
I would recommend this video card to PC gamers who don't want to spend a fortune and have some games that could benefit from improved hardware.