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Too much undervolt results in no BIOS?
Hello!
A few months ago i bought a GA-MA78GM-S2H board and an amd 4850e to fit in it. I also got all the other stuff to make a pretty decent htpc, which has been running just fine ever since. Last week i tried to underclock and then undervolt the cpu to see if i could get the temperature down a bit. I'm at work now, so i don't remember the exact figures, but i lowered the multiplier and vcore and booted. Everything was fine, i got lower temps. I used it for a few hours, then switched it off. A few hours later i came back, and it wouldn't boot. Opening the box, i saw that everything would power on (fans running, disks spinning), except for the cpu fan and apparently the cpu itself got no power either. I cleared cmos, and everything was back to default and running just fine. I tried underclock and undervolt again (same values), reboot, go into bios (worked fine, showing the new values), then reboot after a few minutes. Again, dead cpu fan and apparently no power to the cpu. I don't know much about clocking either way, and certainly not much about undervolting, but can anyone enlighten me on why it would not boot? Especially why it boots right after the changes, but not the second time? |
#2
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Too much undervolt results in no BIOS?
"chhjposter" wrote in message ... Hello! A few months ago i bought a GA-MA78GM-S2H board and an amd 4850e to fit in it. I also got all the other stuff to make a pretty decent htpc, which has been running just fine ever since. Last week i tried to underclock and then undervolt the cpu to see if i could get the temperature down a bit. I'm at work now, so i don't remember the exact figures, but i lowered the multiplier and vcore and booted. Everything was fine, i got lower temps. I used it for a few hours, then switched it off. A few hours later i came back, and it wouldn't boot. Opening the box, i saw that everything would power on (fans running, disks spinning), except for the cpu fan and apparently the cpu itself got no power either. I cleared cmos, and everything was back to default and running just fine. I tried underclock and undervolt again (same values), reboot, go into bios (worked fine, showing the new values), then reboot after a few minutes. Again, dead cpu fan and apparently no power to the cpu. I don't know much about clocking either way, and certainly not much about undervolting, but can anyone enlighten me on why it would not boot? Especially why it boots right after the changes, but not the second time? I do some overclocking and at some point the system may boot once and fail the second time. That is just one symptom that may pop up when there is insufficient vcore voltages. The entire formula is the same with the processor at default or lower than default speeds........the processor needs a certain amount of voltage to run and a bit more to boot. A restart may boot fine and a cold boot may not. A small vcore decrease probably is not going to help the temps much just like a small increase does not raise the temps a lot either. Ed |
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