Need some advic e on ram

I have heard that some systems dont like low timings ie 4-4-4-12, i have a ecs 7050m-m v1.0 + amd 64 x2 5000+ with a x1950pro. i want to upgrade from 667mhz to 800mhz and im looking for sumit as fast ie low latency as i can get for as cheap as posible, this looked fairly good Corsair 2048MB TwinX XMS2 6400 C4 DDR2 4-4-4-12 800Mhz Memory Kit(2 x 1024MB) £26