Corsair TWIN2X1024-4300C3PRO
 

"Unless you're planning to heavily overclock your ram or system, high
frequency DDR2 kits are a bit of a waste of money considering their
conservative timings. The 4300C3PRO is fully suited for overclocking, and
so long as you stay at around DDR2-667 and lower, the lower latencies will
make a bigger impact on performance."

http://www.viperlair.com/reviews/mem...DR2/4300c3pro/