Memory and hard drives are both very different. The more 150GB raptors you have in RAID, the faster it will be. The 32-bit windows XP does technically support 4gb, but only 3gb will show up. The other GB is used for managing the insane ammount of RAM. The reason it will be slower is because 4gb is more RAM than the computer will know what to do with, try to cache way to many things in the RAM, and it's very complicated to explain, and I don't fully understand the details of it, but all you need to know is this:
On a 32-bit OS, 2GB is faster than 4GB. He can put the other 2GB in another computer or something, mabey even sell it.
On a 32-bit OS, 2GB is faster than 4GB. He can put the other 2GB in another computer or something, mabey even sell it.