I recently bought a pair of 512mb SDRAM DDR2 533 to up my computer to 2gigs. The 1g already in the computer is 2x512mb DDR2 266. I'm still waiting on it to arrive, but after reading a little about RAM (I'm kind of clueless on it) it seems that the new ram will have to run at the slower 266 (If the 266 is left in the computer). So I guess my question is, would I see more performance out of leaving all of the RAM in to run at 266, or to take out the slower sticks and leave in the faster? And if I should leave them in...would there be a significant increase in replacing the slower sticks with faster 533 ones?