The Sapphire Radeon X800 is clocked at 391.5 MHz core and 351 (702 DDR) MHz memory. The 391.5 MHz core clock is a bit shy of the 400 MHz ATI specs. We're not sure of the reason why Sapphire would choose to downclock their cards from the reference specifications. They did; however, include an overclocking utility, Redline, that easily clocks the core to 400+ MHz. They also doubled the memory from ATI's reference to 256MB, which is a nice bonus.