Thanks Minime,
I spot the problem in your CPU-Z output:
>>Northbridge - SiS 661FX rev. 11
>>Mainboard Model - MS-7060
You have an SiS chipset motherboard, no support for dual-channel or low memory latency. Basically, whatever CPU you put in that chipset/motherboard is going to be crippled to Celeron performance. That is, I do not believe that chipset supports some of the basic performance functions for your CPU (dual-channel, performance mode, etc.etc.).
If you download SiSoft Sandra and run it's memory bandwidth tests, this should indicate everything. A good running P4 3.0-3.2 should be able obtain 4900-5100mb/s memory performance on a good chipset/dual-channel motherboard. In the case of your SiS, I'll be surprised if it's getting 3000mb/s bandwidth. This will also cripple the Prescott core's arithmatic functionality and cache improvement.