My father has a Dell 4550 sytem and he wants to max out the memory to 1gb. The computer uses PC2100 but there is a 256mb 2700 module in one of the slots?? I guess PC2700 works fine in that sytem?? Would it downclock from 333 to 266?? The memory i'm looking at is Mushkin(Green) 1Gb PC2700 on NewEgg for $97........Thanks