I an recently built a new PC. After completing it I am noticing a really high pitch humming noise. Sound like a dog whistle or like the noise a TV makes when it is turned on. I cant really sit next to my PC because of it. From doing a butt load of troubleshooting I finally put my ear right behind the CPU on the back side of my case and it is definitively coming from the CPU (or very near that location). There are a bunch of capacitors around it.
I have ran CoreTemp and Prime95 for about 5 hours and the temps stayed around 45C. I seems like when there is HD activity the noise stops for a sec then starts back up. When Prime95 was running I really didn't hear it.
My question is do you think its the CPU or the Motherboard? I bought both from Newegg and wanted to RMA them but not sure which one.
I have read that it could be the PSU as well but the noise is sure coming from the CPU (or very near it).
Motherboard - GIGABYTE GA-Z68X-UD3H-B3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
I used a cardboard tube from the toilet paper roll (nice idea by the way) and isolated the noise to right behind the CPU on from the back of the motherboard. I am not sure if its the CPU or something on the motherboard around the socket making the noise.
As for my temps I think my ambient is just low. Plus I am using a Hyper 212 Plus as my cooler.
I have removed each device one at a time and then with just the PSU powering the motherboard and an OS drive and still hear the noise. However when I run Prime 95 I don't hear the noise. I also downloaded and ran PerformanceTest from PassMark on my OS disk (only one in right now) and didn't hear the noise either. It's almost like it does it when it's idling?
I have confirmed, Prime 95 is running 4 threads. When Prime 95 is not running I hear the noise and my voltage multiplier is at x16.0. While still hearing the noise I started Prime 95 and it stopped right away. My voltage multiplier went to x34.0.
I am not overclocking, this CPU (i5 2500k) is at stock settings. I have also reseated the CPU and cooler.
To Geofelt, thanks for the hint, I just stopped the fan with my finger and I still hear the noise. I also stopped my front and rear fans, still hear it
Thanks for the additional tips. I actually did try touching the components and have not found one that stop the noise. I will keep reading about coil whine, it appears a lot of other have the same issue with other builds.
I just started the RMA process for both my CPU and motherboard on newegg. Tomorrow I will swap the CPU out with one I have at work. If it stops I know its the CPU, if not its got to be the motherboard. I was thinking about just sending them both back to newegg but I don't know how that would fly?
I have taken everything out of the case. I just had a HD with and OS, PSU, memory, CPU and motherboard. I am positive its coming from the motherboard or CPU socket area. Just not sure which component it is.
Thanks for all the posts...I will post back tomorrow with an update. Just in case anyone want to know
I think I may have found the reason. So after searching for "Coil Whine" (thanks geofelt) I came across the C3/C6 State Support. I went in my BIOS and set the setting to disabled (was set to Auto). Rebooted and ran for a bit and did not hear the noise. Then I went back into the BIOS and set it back to Auto, rebooted and I hear the noise again.
I was thinking about simply leaving it off. However will this have any negative impact? In the future I would like to OC my CPU, will this setting come back to bite me?
Before I disabled the C3/C6 settings I disabled the EIST Function, but that did not make a difference.
C3/C6 State Support (Note 1) Allows you to determine whether to let the CPU enter C3/C6 mode in system halt state. When enabled, the CPU core frequency and voltage will be reduced during system halt state to decrease power consump-tion. The C3/C6 state is a more enhanced power-saving state than C1. Auto lets the BIOS automatically confgurefthisfsetting.f(Default:fAuto)
CPU EIST Function (Note 1) Enables or disables Enhanced Intel SpeedStep Technology (EIST). Depending on CPU loading, Intel EIST technology can dynamically and effectively lower the CPU voltage and core frequency to decrease average power consumption and heat production. AutofletsfthefBIOSfautomaticallyfconfgurefthisfsetting.f(Default:fAuto