"MustKillMoe-Wheee!" wrote:

My friend has 128mb at pc2100. I want to buy him a 512 pc2700 that's on
sale. Should I take out the 2100 ram entirely?

If he is using Windows XP, maybe not.

If he is using Windows 98 or Millennium, then he won't be able to use more
than 512MB anyway.

How much ram you can use depends on your hardware and software. The 512MB
is a lot for most Windows personal computers, in my opinion.

Good luck.