I am running Windows 7 Ultimate 32 bit with 4 GB RAM... My Intel Core Duo 1.73 GHz doesn't support 64 bit. I have been looking into a Intel Core 2 Duo, but don't know if my computer's motherboard is compatible. I have a Toshiba P105-s6177.

http://ark.intel.com/Compare.aspx?ids=27232,33099,

Here are the stats of my CPU vs the one I am looking at. Are they compatible?

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I don't think so. Since upgrading CPU may result in BIOS error. You may need to upgrade the BIOS as well when upgrading the CPU.

I see...

In theory, it should work because the sockets are compatible.

but as khakilang said, there may be an issue with the BIOS not recognizing the new processor.

I agree, you may run into BIOS issues

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