Spec Page

 

According to the specs, your computer can use the following:

 

Intel® Pentium®  4 with Hyper-Threading1 technology

3.2GHz/800MHz front side bus, 1MB advanced transfer cache

3.0GHz/800MHz front side bus, 1MB advanced transfer cache

2.8GHz/800MHz front side bus, 1MB advanced transfer cache

 

Intel® Pentium®  4

2.80GHz/533MHz front side bus, 1MB advanced transfer cache

 

Intel®  Celeron® 

2.80GHz/533MHz front side bus, 256K L2 cache

2.60GHz/533MHz front side bus, 256K L2 cache

2.40GHz/533MHz front side bus, 256K L2 cache

 

Some good places to find processors are pricewatch.com (Computers > CPU > Select the processor you use), Google's Froogle system, and Yahoo's product finder.