Quote Originally Posted by rhythmtech View Post
i just got 2 gig pc6400 800mhz

i already have 1 gig pc2 4200

is it better to run all3 or just the 2 fast ones as i was told they go by the slowest ones speed anyway
Aye, they'll all run at the slowest speed.
So you'd be best off just running the two fastest ones.

Plus mixing RAM can also cause your system to become unstable, especially if they are from different manufacturers.