Question about Toshiba Satellite 1135-S125 Notebook

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CPU Upgrade Hi, I have replaced my Celeron 1.8 CPU with a Pentium-M P4 2.4MHz. The system is running but when I check it in the system info or any benchmark program, I read the CPU but it says running at 1.2 Ghz. Is this because of the incompatibility of the motherboard. How can I fix this.

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  • naber Apr 04, 2008

    Thanks for the valuable information. But it is still 1.2 Ghz. Bios is updated. Is there a way other than a Toshiba site that I can update this bios.




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Sounds like Toshiba never intended Satellite 1135 Celeron laptops to support Pentium. Chipset abilities don't matter if the MB and BIOS don't support them.

The safe approach is to upgrade with a cpu from the same series that the units were sold with.

I updated my unit's BIOS to 1.70, and then swapped the original 1.8 G Celeron M "Northwood" with a 2.4 G. Simple drop-in replacement is all you are likely to get from these units, because the stripped-down BIOS set-up offers little more than date/time, password and boot device - no CMOS or chipset tweaks.

May seem lame - but these units work well within their design specs.

Posted on Jun 17, 2011

  • levinel Jun 18, 2011

    Additional info... 1135-S1552 and 1135-S1554 did come with Pentium M. And the same 1.70 BIOS update utility is used for all nine 1135 models. Hopeful signs, but it still remains to be seen if Pentium M can actually be used on the other MB's. I have an 1135-s125, just like the OP.

  • levinel Jul 04, 2011

    ...I figured I'd try this for myself, and bought a SL6V9 2 GHz Pentium M (trivial cost, and I assume the next stepping of the processor that came with the 1135-S1552). Heh, but I also got only 1.2 GHz. SpeedswitchXP - which tests for max speed by making cpu perform a set of instructions - indicates only 1.2. Confirmed by benchmark testing with CPUBENCH and PC Wizard: half the performance of a 2.4 GHz Celeron in the same board... Me, I'm going back to that 2.4 GHz Celeron upgrade.
    Contributors here at Fixya are genuinely and sincerely helpful - but check out the rest of the web. Perhaps you'll agree that the folks who REALLY know about mainboards and cpu's and gnarly operating system issues just don't seem to hang out here or at similar general-purpose help sites.


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That is because FSB of 2.4 is high than motherboard can take
U need to see what is max of motherboard FSB and get procesor with that FSB
U cant upgrate bios for this penitium P4 2.4mhz.

Posted on Oct 09, 2008

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Dear naber

The TOSHIBA Satellite 1135-S125 contains the
Intel 852GM chipset soldered on your motherboard (non removable) which is capable for speeds of 400mhz system bus. Actually what this means is that it capable of running your Pentium-M P4 2.4. so I would doubt a motherboard incompatibility.

The processor runs at the speed you state (1.2 GHz) in battery-optimized mode (1.2V core) (24/2multiplier) instead of its full potential when unplugged from the AC adaptor. I believe the speed remains like that even when plugged at the cable due to dynamic switching either at the BIOS or Windows. This means that the system is slowing down deliberately the CPU until a certain % and then it kicks in full power. (24x100Mhz=2400Mhz multiplier) (For heat purposes mainly,also increases the CPU this is normal operation and you should not be worried)

Please download the utility cpu-z at the following link

and check what I am saying. It will be displaying the Ghz of the CPU realtime so you can see if when you start any benchmark if it kicks in with a higher multiplier and hence the 2400Mhz speed due to increased stress to the CPU.

Otherwise you may check your BIOS for power management options and switch them to Disable just for testing. (you should enable them back after testing in order to cut down the increased watt consumption)

Lastly if that does not help a Bios Update might be the only resolution. I have found this Motherboad BIOS update for you
ACPI Flash BIOS version 1.70 for Satellite 1130-S155

This bios seems to enable support for CPU's at steps A2 which may be your chip. Unfortunately you did not state the BIOS revision so if it the V1.30 this bios will also add support for CPU's at stepping D1 as well.

If you found this info helpfull can you please rate the solution, Thats what keeps us going!

Posted on Mar 31, 2008

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You should be able to upgrade the CPU, since it seems that the DV1000's motherboard uses a socket CPU design. But, obviously, HP would rather have you choose the CPU that you want from the beginning and stick with it.
The first thing to do is to check HP website to see what other configurations were/are sold for your model. If they sell it with faster CPUs then you can upgrade to one of them...

In order for a particular processor to be compatible with a particular laptop:
(1) the processor must be physically compatible with the laptop socket, in your case I thing you have a Soket 479 processor
(2) the laptop chipset must support the processor.
(3) the chipset front side bus speed must match the processor front side bus speed, in your case 400Mhz.
(4) the laptop BIOS must support the processor.

So I listed here processors with FSB at 400Mhz, I gues that DV1000 as a 855GM Motherboard that supports only 400Mhz with Socket 479

Pentium M

Pentium M 1.3 1300 1024 400
Pentium M 1.4 1400 1024 400
Pentium M 1.5 1500 1024 400
Pentium M 1.6 1600 1024 400
Pentium M 1.7 1700 1024 400

Pentium M 710 1400 2048 400
Pentium M 715 1500 2048 400
Pentium M 725 1600 2048 400
Pentium M 735 1700 2048 400
Pentium M 745 1800 2048 400
Pentium M 755 2000 2048 400
Pentium M 765 2100 2048 400

Celeron M

Celeron M 310 1200 512 400
Celeron M 320 1300 512 400
Celeron M 330 1400 512 400
Celeron M 340 1500 512 400

Celeron 205 1200 512 400

Celeron M 350 1300 1024 400
Celeron M 360 1400 1024 400
Celeron M 370 1500 1024 400
Celeron M 380 1600 1024 400
Celeron M 390 1700 1024 400

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