I am going to get a Zalman CNPS7000 to cool my P4 2.8C. Will there be a large difference in CPU temps for the all Copper versus the Copper/Aluminum combo heatsink. I am worried about getting the all copper heatsink because of its massive weight (773g) which is well above the Intel's reccomended max weight. I will be may be moving the computer around, and do not want to worry about damaging my processor. On zalmans site there is a warning to be careful when moving a computer with the copper hsf and that they are not responsible for damage occured when moving ur computer. link

I may doing some overclocking, but I'm not sure yet. Which one would you reccomend I go for? Is the all copper hsf really going to cause a problem?

Thanks!