ATI will introduce Overdrive 4 with the next Catalyst Driver scheduled in March which allows you to overclock both core and memory and the frequency range will be increased to 75% of the next higher class product. This rule does not apply to the XT and XT PE versions of the card and it does not apply across video card generations. One requirement for Overdrive 4 is that a digitally-signed “SecureBios” is present on the video card and another is that a thermal sensor circuit MUST be present on all cards supporting Overdrive 4 because temperature monitoring will be used to prevent overheating damage to the chip.

ATI will introduce Overdrive 4 with the next Catalyst Driver scheduled in March which allows you to overclock both core and memory and the frequency range will be increased to 75% of the next higher class product. This rule does not apply to the XT and XT PE versions of the card and it does not apply across video card generations. One requirement for Overdrive 4 is that a digitally-signed “SecureBios” is present on the video card and another is that a thermal sensor circuit MUST be present on all cards supporting Overdrive 4 because temperature monitoring will be used to prevent overheating damage to the chip.