I just got in a few new Dell 4600's at work. They have the new 800mhz P4's with hyperthreading. I noticed that they had two 128mb sticks of ram in each and that there were 4 banks for memory but it looked like they were in pairs. Do you have to , or should you add memory in pairs for these type of systems? I am an AMD guy so I am not up on any of the intel stuff.