Well I am not sure about the A-data, but I have the kingmax hardcore, the timings at ddr 500 speeds are pretty lousy, and none of my intel chipset motherboards even support such lousy timings, keeping me from getting to ddr500 speeds. The timings at DDR500 are 3-5-5-10, but I can still get ddr 490 at 3-4-4-8, which is the slowest timings my boards allow.