I'm not 100% satisfied with the performance of the VF900cu With the fan in high setting it's quieter than the stock cooler on the X1900XT and cooler by 9-10 degrees but with the fan on low setting my temps were on 93 and raising so I decided to keep it on high all the time. Tomorrow if I get the tools I'll drill the holes on my Swiftech MCX462 heatsink and use that. Should be much better than VF900cu.