upgrade from 2.4 celeon to P4 2.8

November 7, 2009 at 02:55:59
Specs: Windows XP
I have a P4 2.8 Norwood 478. want upgrade my P4 2.4 Celeon Norwood. Tried it 'worked but: the cpu speed dropped from 2400 to 2100

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#1
November 7, 2009 at 06:29:51
You need to provide some motherboard info before anyone can help...

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#2
November 7, 2009 at 06:33:43
This is a hardware or CPU question, not an XP question.

The P4 Northwood runs at 533MHz FSB with a multiplier of 21x. The 2.4GHz Celeron runs at 400MHz FSB with a multiplier of 24x.

One of two things is going on:

- either your motherboard doesn't support 533MHz FSB so it's defaulting to 400MHz FSB. 21 x 100MHz (400MHz FSB) = 2100MHz

- or your board does support 533MHz FSB but you didn't change the setting.

You should ALWAYS check the motherboard's CPU support list before buying a new CPU.


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