5600 vs 7200

It may be a $30 difference, but 7200 RPM hard drives do have a noticeable performance improvement over 5400 RPM hard drives. However, on a system that old, it's hard to say if it would make very much of a difference.

I would say if you plan on using the P166 for a good while longer, get the 5400 and save yourself $30, but if there is any slight possibility of upgrading in the near future, definitely get the 7200 rpm.


<i>I don't know anything about computers... but I did stay at a Holiday Inn last night...</i>  

The computer is old I do not think there will be an big difference in performance. Just get the cheaper one. You might want to make sure the motherboard supports hard drive larger than 8.4 Gig.