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IBM R40e compatibility


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Hi I bought and fitted a Corsair PC3200 chip (512Mb) to my IBM R40e laptop. It appears that I should have bought a PC2700 or PC2100 according the the machine spec. But I read on the internet that normally chips are backwards compatible. The system will boot OK but it reperts that the chip is only 256Mb not 512 Mb. I have tried cpu-z and it says that the chip is 512Mb but windows,the BIOS and memtest say its 256Mb. Should I just cut my loses and buy a slower chip (thats more expensive) or is there a work arround for this. Is a bios update worth a go ?




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