From what i know it would be faster somewhat...

EDIT: Here's one opinion.....In full tweaker's fashion, it is possible to eke a little more performance out of DDR2-1066 vs DDR2-800. Since DDR2 suffers from high latencies, it all comes down to the timings! And in general it is preferable to stick to one of Intel's high-end chipsets for max memory controller speed and efficiency, or to stick to one of AMD's faster CPU's for a faster clock speed for the on-die memory controller. You may also have to jack the RAM voltage way up for low-latency stability, or increase the RAM's speed to compensate for relatively high latencies (which is what DDR2 was meant for!).

However, when OC'ing or tweaking, consider the balancing act required for max performance for your usage model. Gaming benefits more from lower latencies than extra speed on a ratio basis. Thus 4-4-4-12-1T @ 1066 MHz is far better than 4-5-5-14-2T @ 1200 MHz. Also keep in mind that the performance hit associated with higher latencies and RAM speed is more noticeable on a mid-range AMD CPU vs a high-end Intel chipset w/Intel CPU. So simply increasing the RAM speed with the same timings is beneficial to Intel-based systems more than AMD-based systems. This is why Intel is pushing these insanely fast 1333 MHz DDR3 modules for their systems - it really will help them more than AMD, which is holding off on DDR3 until 2009.

Cheers for the info buddy