Member Avatar for thewrencher

I have a Toshiba M35X laptop I would like to upgrade.
I would like to know if I could replace the celeron M cpu,with a
Pentium 4 M.
Thanks in advance for any help.

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Short answer: do not try to swap a Celeron M for a Pentium 4-M in a Satellite M35X. They are different platforms. Most M35X units use an Intel 852/855-series chipset with a Socket 479 CPU (Celeron M/Pentium M). A Pentium 4-M is a NetBurst chip for Socket 478 and is not pin-compatible. Even if you could seat it, the BIOS, power delivery, and cooling are wrong for a P4-M and it would not run reliably. is right that chipset support matters, but in this case the sockets themselves differ, too.

The valid upgrade path here is Pentium M (not Pentium 4-M). If your M35X has the common 400 MHz FSB 852/855 chipset, look for a 400 MHz FSB Pentium M: 725 (1.6), 735 (1.7), 745 (1.8), or 755 (2.0). Those usually drop in, offer a big bump from the Celeron M thanks to larger L2 cache and SpeedStep, and have similar thermals so your cooler can handle them.

Before you buy anything:

  • Verify the chipset and socket with a tool like CPU-Z.
  • Check if your CPU is socketed (ZIF lever) or BGA-soldered; if soldered, there is no practical upgrade.
  • Update to the latest Toshiba BIOS for your exact M35X model so it has proper microcode.
  • Use fresh thermal paste and confirm the heatsink makes full contact after reassembly.

If you want specific model confirmation, post your exact M35X submodel (e.g., M35X-Sxxx) and chipset readout, and folks can sanity-check a matching Pentium M part number for you, .

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Member Avatar for jo2995

Um, I'm not sure, but I think it should work as they share the same socket number, but make sure the chipsets work too.

Member Avatar for thewrencher

Thanks for your reply.

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