i have a 1g stick of pc 2700 that runs at 200 Mhz
And a stick of pc 2700 512 stick that is at 166 mhz
but it wont run at 200MHz-Data 1GB 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered System Memory Model VDBGC1A16 - OEM (newegg.com)
but again, it will be running at 166MHzis it better than 1.5gigs of pc2700 166mhz

Assumign the sticks are of comparable performance, the answer is "most of the time"and is it better to have two 512 sticks or one 1gig stik?
