Upgrading laptop CPU (Desktop style Processor)

[Boltaction]

Hello, I have an HP ze5700 laptop.

Specs:
2.8 celeron
768 DDR333 ram (running at 266)
60GB HD
15.0 Uxga+ screen

A nice laptop except for the processor, but I noticed some interesting information: The same model can be had with a 2.6 P4 processor instead, running at 533fsb. Without much more evidence I can guess the motherboard supports a 533 bus as opposed to the 400 the processor is running at.

Before anybody says anything this is not a mobile processor. Repeat: Desktop processor.


Here is my question:
I want to give it a new processor, but I want to save as much watts going to the proc as possible. I know the celeron Ds would work, but I need a processor that uses less energy than the one it has. Can anyone help me out?

 

[Dan_D]

In the desktop processors you're as low as your going to get. Unless you want to downgrade further. You won't save on any battery life, and you'll be sacrificing performance.

Pentium M is the king of low power CPU's in notebooks.

 

[Boltaction]

How? If I got a 533fsb 512k 2.4 Ghz instead, you are saying it would be slower than a 2.8 8k 400fsb?

 

[ziddey]

How? If I got a 533fsb 512k 2.4 Ghz instead, you are saying it would be slower than a 2.8 8k 400fsb?

is your current celeron a mobile celeron or just a celeron?

mobile celerons have 256k whereas regular celerons have 128k

the mobile celerons arent too too bad off