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How do I find the manufacturer to upgrade the BIOS?

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It'll be helpful by telling us the model number of the motherboard, or at least provide a decent picture of the motherboard... –  deddebme Nov 3 '09 at 6:56
    
@deddebme: Or he is asking about ways to know that without seeing physically the motherboard, I guess. –  Gnoupi Nov 3 '09 at 11:04
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5 Answers

Download cpuz from cpuid.org -- It can identify your motherboard for you.

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+1 This is, by far, the easiest method. –  alex Nov 3 '09 at 9:53
    
cpuz is indeed a great reference to find information about CPU, RAM, and motherboard. –  Gnoupi Nov 3 '09 at 10:15
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If you're using Intel, you can identify the chipset by using the Intel Processor Identification Utility 4.2.

See this very detailed article for a general method : PC Mainboard Identification.

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I used these instructions and they helped me find the correct motherboard manufacturer

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download and run SIW.

in the left hand navigation pane under Hardware, click on Motherboard.

right below click on BIOS to identify the version currently installed.

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SIW is also a good solution, though maybe less immediate than cpuz, as it provides much more information. –  Gnoupi Nov 3 '09 at 10:26
    
both programs belong into techie's toolbox anyway. :) –  Molly7244 Nov 3 '09 at 14:46
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What I do is run dmidecode, or lshw, if available.

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