I have recently installed the XFX Radeon 5870 with the ATi Tray Tools. According to me everything is running properly except the clock readings. Whenever I try to check the clock readings, it is showing off. With the drivers that I had with the card, there is a utility for O / C "ATI Overdrive", but the concern is that you can not go higher, the max is 900 for GPU clock and memory clock for 1300 (now 850 / 1200). So please tell me the solution for the ATi Tray Tools and XFX 5870 clock issues.!! Hope that someone will help me in sorting out this issue.