"If you're spending your hard earned cash on the new DDR3 standard, then you expect nothing short of stable, dependable performance whether you're using a 32-bit or 64-bit system. The memory must be reliable if you just play games or if your system is a serious number crunching SETI beast. The Patriot Viper 4GB PC3-12800 Dual Channel Memory Kit thoroughly tested here offered nothing short of those expectations. The memory is fully backward compatible with your 1066 MHz and 1333 MHz Core 2 series Intel processors. The extra performance gained from the memory's timings at lower 6-6-6-18 setting should be a pleasant bonus which also equates to plenty of bandwidth."