CPU Bus speed is changing erratically (~0-150 mhz)

[Suyer]

The short of the issue is that my CPU bus speed is changing erratically all over the place (and my CPU clocks are changing with it). The best explanation is a gif of CPUz; It's about 30 seconds long:

https://i.imgur.com/PYa9PKK.gifv

This is at idle, with no games or heavy CPU load. I've confirmed that I can see the same thing happening in HWinfo as well. I don't think this is an artifact from CPUz itself, since whenever this is happening, my computer gets very laggy; all menus get slower and choppy, and attempting to play any game will give me ~10 fps. GPU clocks seem normal.

The issue occurs sporadically, but once it starts happening it doesn't go away for a while. Restarting doesn't seem to consistently fix the issue (one time I restarted 5 times in a row with no change to the issue).

My googling efforts have mostly yielded posts where people are asking about their bus speed bouncing between 96-99 mhz -- in my case, it's much more severe, going between 0 to as high as 200 (once). The solution to the aforementioned 96-99 mhz issue seems to be uninstalling Hyper-V (which I don't have installed).

Unsure what is going on here, any thoughts/help would be appreciated. Maybe my CPU is just going bad?

My computer specs are:

CPU: i7 4770k
Mobo: Gigabyte GA-Z87M-D3H
GPU: MSI Aero OC GTX 1080ti
Drive: Samsung 850 EVO 1tb
PSU: Seasonic 850KM
OS: Windows 10 Pro 64bit

 

[VirtualLarry]

Thottling? What are you using for cooling? Have you checked the "pins" on your cooler, or the mounting in general? Checked the temps?

 

[denis280]

Thottling? What are you using for cooling? Have you checked the "pins" on your cooler, or the mounting in general? Checked the temps?

+1. Take everything apart cooler cpu, and as mention by Larry the pins

 

[Burpo]

Does your bios look like this? Check your values against these or load Optimized defaults..

 

[Suyer]

@VirtualLarry I don't think this is thermal throttling. C-states and throttling are done via the multiplier, but the bus speed never changes. Additionally, my temps are very good, sitting at ~45C under load (water-cooled).

Could be something wrong with the CPU I suppose, pins or such, I'll check this out over the weekend when I have a chance to sit down and inspect.

@Burpo Yep, it does look like--just yesterday I reset my bios to defaults to see if that would help; unfortunately it did not