Memory Upgrades
One thing to keep in mind with memory upgrades is that many computers come with mother boards that support faster than installed from the factory memory. That was to save cost when the system shipped new (and the 533 DDR2 memory was so much more expensive than the 400 DDR2). Sometimes the replacement 533 you just put in there will be slowed to 400 to remain compatible with the "old" memory in the machine. Use the BIOS to see the memory speed with just old memory and just new memory to see if your system might run faster without the older memory in it. If you just bought 2 x 1 gig sticks of 533 to go with your existing 2 x 512 400 - you might be better off with only 2 gig of fast ram instead of 3 gig of slow ram
