Others have stated that this is an issue with the power supply, I will be sending this back rather than buy a Dell OEM power supply... Very annoying. Shows in system info that the processor never goes over 792 Mhz. Running side by side with the Celeron box with 8 Mb of ram that this was supposed to replace, this machine is significantly slower than the Celeron machine and also would periodically freeze.After looking in Dell Forums, this seems to be an issue with certain versions of the biosVendor issued a returm auth and it was returned with no issues. The item had arrived well packed and looking new. It's a pity is was just so slow.