changed CPU in old pc, issues

[Chalky Emultion]

hi,

I have a pc with an Asus P4S8X motherboard (socket 478).
Today I replaced my Pentium 4 2533 MHz with a Pentium 4 2800 MHz, but... all is slower! also I can see lag when i'm surfing in my BIOS options...

Why this is happening?

 

[AddRAM]

Does that cpu support hyperthreading ?

Is hyperthreading enabled in the bios ?

It sometimes gets disabled when you swap a cpu.

 

[Chalky Emultion]

both CPUs have got a Northwood core, which does'n support Hyperthreading. They are in the same Pentium 4 family, just one has a little better frequency than the other.

I can see lag not only in Windows, but also in BIOS!

 

[Zepher]

Did you clean off the old thermal paste and put new paste on the CPU?
If not then it may be getting too hot and throttling to keep from overheating.

 

[Chalky Emultion]

Did you clean off the old thermal paste and put new paste on the CPU?
If not then it may be getting too hot and throttling to keep from overheating.

I did it... Nothing.
I re-installed the old cpu, which is a lot faster...