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Best method to clear CMOS- use onboard CMOS button or remove MOBO battery?

I have an Asus Maximus VI MOBO and need to clear my CMOS

If I remove the battery for roughly 30min, is this the best way to clear the CMOS, or should I go another route?

What's best practice here?
6 answers Last reply Best Answer
More about method clear cmos onboard cmos button remove mobo battery
  1. You need to remove the CMOS battery for 10 seconds only. Capacitors can't keep power for more than a few seconds at best.

    If you have a button that does the same you could use it, but check your motherboard manual first to make sure this is the same thing.
  2. Best answer
    Just use the button. It's much easier, and that's what it's there for.
  3. Thanks guys,

    Just for clarification- I just updated BIOS. This didn't need to be done beforehand to fully clear the CMOS did it?
  4. No, the info contained in the CMOS is independent of the BIOS, you should be fine.
  5. Okay good to know. One last question for you guys:
    I was just reading through my manual and noticed it recommends renaming the BIOS file as m6h.cap before the flash. I did not do this! I kept it as asus had it labeled- I had no errors, and the bios seemed to flash properly. Should i be concerned?

    I think i got lucky in that i updated the bios via dos & the asus bios updater - another words, i manually selected the appropriate .cap file. I shudder to think what might have happened had i used the flash method without renaming thr file first
  6. I never heard of having to rename a file before flashing. I mean it's no different than a Word file, in the sense that renaming it won't change the content inside. As long as you push the right file. When you download a new BIOS version there will be only one .cap file anyways so you cannot make any mistake. Bottom line, I don't think the file name is important, you could name it "totalcrap.cap" as long as it contains the right version for your BIOS it will work.

    Or I think I understand now, you might have been reading the wrong part where they instruct you how to automate the flash, like if it's done from a script or something, the script might look for a specific file name, but if it doesn't find it, then nothing will happen you'll probably just get an error that file was not found and no harm will be done.
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