Upgrading laptop CPU please help

Sorry, the links didn't work, and its not letting me change it. Hope this works :S

Intel® Celeron® Processor 900 ]http://ark.intel.com/Product.aspx?id=41498]

Mobile Intel® GL40 Express Chipset ]http://www.intel.com/products/notebook/chipsets/gl40/gl40-overview.htm]

]http://www.emachines.co.uk/em/product.do?ctx1w.att21k=2&LanguageISOCtxParam=en&sp=page7l&link=ln40l&CountryISOCtxParam=UK&ctx1l.c2att1=17&kcond4l.c2att101=58401&CRC=608969292]

I hate to say this, but according to this page, it looks like your motherboard only supports the Celeron processors: http://ark.intel.com/chipset.aspx?familyID=35507

*scroll down to "Valid Processor Combinations"*

Have a look at this and see what you guys think.

http://forum.notebookreview.com/showthread.php?s=fb8efb...

Well, if someone's done it, I guess it's possible. I was just going off the info that Intel was providing for their chipset. Based on that thread, some people are having issues with 800 FSB CPUs working properly so you'd need to find one that had a 667 FSB.

Okay, thanks  
Do you know if that would give me a reduction of performance to the 800 FSB chip? Although I've seen people on that forum have the 800 working fine.

Sorry, I meant 667 FSB the first time, not 800 FSB

If they have the same clock speed (say both run at 2.1ghz) then no, there probably won't be much of a difference. Certainly not noticeable for everyday tasks.

Just a quick note to say I have the Acer version of that laptop on the way (Extensa 5230 something I think) and I also have a T4300 processor I got off eBay for $40ish and will be attempting this soon.

That GL40 chipset appears to support 35W, standard voltage, Socket P processors. Hence:

Celeron Single-Core 900
Celeron Dual-Core T3000
Celeron Dual-Core T3100
Pentium Dual-Core T4200
Pentium Dual-Core T4300

The T4300 processor is in and I'm posting from it now.

Windows noted a good speed increase (CPU score from 4.4 to 5.4 and memory score went from 5.1 to 5.4) but PassMark benchmarking noted NO changes.

It does run just as cool as the Celeron 900 2.2GHz chip did. 37-40C most of the time, 48C max, 30C cold idle after booting and sitting at the desktop for a few minutes. This is only 2 degrees hotter than the Celeron at max and during use. The idle temp is actually 2 degrees cooler.

It may not win speed contests but it FEELS quicker. No more lagging because of single core limitations. I can run my browser, PowerPoint, PS Elements, and iTunes all at the same time and nothing gets jittery like it did before I did the CPU swap.