I have decided to upgrade the cpu in my Dell 4600. I just want to up the performance a little to hold me over another year or so. I currently have a 2.4b 533fsb and want to go to a 3.0ht 800fsb or a 3.2ht 800fsb both northwoods. My first question is would a 3.0 1mb l2 cache be better than a 3.2 512k l2 cache. My second question is when I upgrade should I stay with the stock thermal pad or do away with it and use a grease such as Artic?