What timing for RAM is optimal for me?

[tigersty1e]

CPU-Z reads my RAM timing as 266 MHZ (4-4-4-12) and 333 MHZ (5-5-5-15)

If I run my FSB at 301-320, can I run my timings at (4-4-4-12)?



Asrock 4CoreDual-VSTA
E6300
generic 500watt power supply
1 gig CORSAIR XMS2 240-Pin DDR2 SDRAM DDR2 675 (PC2 5400)