Boot to Windows. Install ATI Tray Tools from the following link. Use to to set the fan speed to max while playing as a test to see if any crashes occur. If none after some time, reboot and play again without setting the fan speed to see if it's alright like this.
(To set fan speed in ATI Tray Tools, right click the icon in the system tray near the clock, choose hardware then overclock settings. Change to the fan tab. Click the Manual Speed radio button. Drag the slider to 100 then hit apply.)
As per the question in the pm, you can set the voltage and timings manually by booting to the motherboard bios settings. To do that, keep on pressing delete on the keyboard until the blue settings screen shows, while powering on.
After making changes, hit F10 on the keyboard, Y and then enter to save them. Most bios are like this.
For now, the voltage will be easiest to set for you, which may be most important.
Find the memory setting that should say 1.5v and change it to 1.65v. Save and reboot. All bios are different with settings. Consult your motherboard manual if need be.
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