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.

    Thanks

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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 life..so this is normal operation and you should not be worried)

Please download the utility cpu-z at the following link

http://www.cpuid.com/cpuz.php

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 http://www.csd.toshiba.com/cgi-bin/tais/su/su_sc_dtlViewDL.jsp?soid=521179&moid=430235&rpn=PS113U&BV_SessionID=@@@@1021980656.1206965091@@@@&BV_EngineID=cccdadedjmhfdeecgfkceghdgngdgmn.0&ct=DL&all_docs=false

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.

Regards
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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Banias
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Dothan
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Pentium M 755 2000 2048 400
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Banias-512
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Celeron M 330 1400 512 400
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Dothan-512
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Dothan-1024
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Celeron M 370 1500 1024 400
Celeron M 380 1600 1024 400
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