It runs on both WinXP and Win7. It's recognized as a R9 200 series on WinXP and is not Overclockable on it unless use Afterburner even then it's kinda iffy. Win7 recognizes it but if you try to install drivers through the AMD Website your in for a long haul. Just install the provided CD drivers. Overall didn't see a big difference from a r7 240 to this... Until, i upped the Graphics quality. The Benchmark scores where the same or a little lower compared to the R7 240 on the PSO2 benchmark using the settings i always use. But, the performance is revealed once you start racking up the settings. so it was confusing at 1st since i would've suspected higher score on the same basic settings. It looks awesome and runs awesome no glitches that i have noticed runs my old games at high settings. Would recommend once prices drop as the Radeon RX 480, 470 and 460 are coming out and the Radeon RX 460 is to be a little stronger and more efficient than this. But, if your set on this go ahead it's quite good. I have mine OC to 1200mhz Core and 1500 Memory. I'm running a EVGA 600 watt PSU, Phenom 9500, 4gb ram WIn7/XP