Corsair TWIN2X2048-6400 PRO 2GB Kit
 

"In regards to the Corsair TWIN2X2048-6400 PRO itself, the memory is
Corsair's usual high quality stuff. Performance is on par with the
Ballistix kit, winning some, losing some, and is a good overclocker. This
is pretty important for those of you still using 915P/925X based boards
where 533MHz is the current official ceiling, so there's plenty of
headroom to move upwards. One thing to point out though is your
overclocking success will vary depending on the hardware setup you have."

http://www.viperlair.com/reviews/mem.../DDR2/6400pro/