- Joined
- Sep 27, 2002
- Location
- Alberta
Okay, I've run into the weirdest problem that I thought some of you guys may be able to help with.
TL;DR
My CPU is making an odd buzzing sound that is related to C-states.
Long version
I bought a new A6-3500 Llano paired with Asus F1A75-I Deluxe motherboard. I put it together and noticed that it starts to make a buzzing sound as soon as Windows boots, and sometimes in the bios interface. It sounds like the sound that older hard drives used to make when they were seeking.
1) Buzzing sound is unrelated to any fans, since it persists with all the fans unplugged and the power supply moved far enough away that I would be able to tell the direction of the sound.
1+) Also not from hard drive since the sound persists even when I disconnect HDD and boot Linux off a USB (also shows it's not Windows related)
1++) Also not coming from speakers as all speakers, including system speaker, are disconnected.
2) The buzzing sound appears to be coming from around the CPU socket.
3) The sound changes frequency when I move the mouse and goes back to the same frequency when I stop moving the mouse
4) Sound disappears when the CPU is under load
5) Problems 3 and 4 made me think that it's related to power cycling transition, when the motherboard switches the CPU on and off rapidly. To address this, I found that disabling BOTH C-6 state and some ambiguous "C-state Pmin" option in the bios completely makes the sound disappear
6) Thinking it was some weird vibrating capacitor of the motherboard, I RMAd the motherboard, but the new board still makes the same noise
7) This leads me to believe that it's the processor but I don't have time to keep RMAing things
So has anyone else run into anything similar?
Any clue as to what's causing this?
TL;DR
My CPU is making an odd buzzing sound that is related to C-states.
Long version
I bought a new A6-3500 Llano paired with Asus F1A75-I Deluxe motherboard. I put it together and noticed that it starts to make a buzzing sound as soon as Windows boots, and sometimes in the bios interface. It sounds like the sound that older hard drives used to make when they were seeking.
1) Buzzing sound is unrelated to any fans, since it persists with all the fans unplugged and the power supply moved far enough away that I would be able to tell the direction of the sound.
1+) Also not from hard drive since the sound persists even when I disconnect HDD and boot Linux off a USB (also shows it's not Windows related)
1++) Also not coming from speakers as all speakers, including system speaker, are disconnected.
2) The buzzing sound appears to be coming from around the CPU socket.
3) The sound changes frequency when I move the mouse and goes back to the same frequency when I stop moving the mouse
4) Sound disappears when the CPU is under load
5) Problems 3 and 4 made me think that it's related to power cycling transition, when the motherboard switches the CPU on and off rapidly. To address this, I found that disabling BOTH C-6 state and some ambiguous "C-state Pmin" option in the bios completely makes the sound disappear
6) Thinking it was some weird vibrating capacitor of the motherboard, I RMAd the motherboard, but the new board still makes the same noise
7) This leads me to believe that it's the processor but I don't have time to keep RMAing things
So has anyone else run into anything similar?
Any clue as to what's causing this?