Solved toshiba l455 s5000 cpu upgrade

Toshiba Satellite l455-s5000 15.6" trubr...
August 17, 2014 at 00:26:09
Specs: Windows 64, celeron900/3gigs
cpu upgrade : celeron900 800mhz socket p to intel p8700 2.53mhz socket p ? ,bios cannot upgrade now ,ordered new battery to upgrade bios to 1.30 to 1.50version as cpu p8700 would not run or start but old cpu a celeron900 still runs ok ???

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August 17, 2014 at 03:23:10
I fail to see what a new battery has to do with updating the BIOS as this must be done with laptop running from mains power, not battery power.

Update the BIOS while the Celeron 900 is in the laptop. After successful update, power down, remove the Celeron 900 and install the P8700. Turn on and the P8700 should now be recognised.

Note: Only use BIOS updates from Toshiba.

message edited by phil22

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August 17, 2014 at 06:51:19
✔ Best Answer
How did you determine the P8700 would be compatible? Your laptop is based on the Intel GL40 Express Chipset which only supports up to 800MHz FSB. The P8700 is a 1066MHz FSB CPU. So even if it was compatible (which it's not), it would only run at 1.9GHz.

"Socket 479 and Socket P have both supported two generations of Intel mobile processors, with the later generation having a higher front side bus. In both cases, the later generation of processor will not work with the previous generation of chipset: almost always, a 533MHz FSB Pentium M will not work with a 400MHz FSB chipset and a 1066MHz Core 2 Duo will not work with an 800MHz FSB chipset. 400MHz FSB Pentium M processors work in 533MHz FSB chipsets, but there is no confirmation that 533MHz to 800MHz FSB Core 2 Duo processors will work in 1066MHz chipsets."

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August 17, 2014 at 20:15:05
thanks ,will look for a more compatible c p u duo core .As a dual-duo c p u is necessary for win8.1 apps running now on toshibaL455 system. Still it runs quite nice temps 40c running 3 apps , with new artic silver on c p u ,wish all my apps would run as well.

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