CPU running on slow-motion sometimes

[Nertan Lucian]

I have a weird problem.

Story:
More than half a year ago, CPU started to get very hot and I would get BSOD. I realised is the thermal paste is the root of the problem and I've decided to change it. The problem was that I've never changed the thermal paste, so i've followed the instructions on the cover, which were stupid, since they showed you to apply the paste evenly on the CPU. Which i did, only after patching it up and boot to realise the PC was running slow. I've opened the CPU and saw that because of the pressure thermal paste expanded and leaked into the socket. So i started cleaning it , which took a while but after I was done all went smooth, also I've applied the thermal paste correctly this time and all was fine, I had good and cool CPU.

Problem:
A week ago i've booted and notice all went slow again.
But in a very weird way: If I open a new window the animation is slowed, also on movies the frame rate is slowed, all is slowed down.
Yet when I perform a test on CPU it runs at normal frequency. Also it passes any torture test from Prime95 just fine. The voltage and heat seems fine. Also the highest CPU consuming task takes 02% of CPU and there aren't many tasks. I don't think the drivers are the problem since the first screen, the splash screen from motherboard it takes more time to disappear.

Now the weird part: if i open the CPU, take it off the socket and just put it back in, i don't do anything else, when i start the PC it runs fine even for days. And it stays that way. But if i shut it down, and let it closed for a while, when i start the system the problem reappears.
Any solution other that change the hole system, i mean the cpu works perfectly when it doesn't do this problem

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[Deus Gladiorum]

What CPU do you have and what are your temps which "seem" fine?

 

[Nertan Lucian]

I've uploaded some images,but it seems the forum didn't like the link, so i changed the hosting. I've reedited the first post

 

[Deus Gladiorum]

Those temps are far from fine. Desktop CPUs aren't really meant to go over 60 degrees. The thermal junction max (tjmax) is 62 degrees for your Phenom II X6 1090T. At 62 degrees, your CPU begins to throttle its frequency and voltage so as to cool down, but of course in doing so performance drops significantly.

You need to reapply thermal paste. Also, you should know that every time you remove your heatsink from your CPU you break the thermal conductivity it has and it begins to dry out, completely destroying its effectiveness. Reapply your thermal paste once more (make sure you clean properly with isopropyl alcohol first) and stop removing your heatsink so much.

 

[Nertan Lucian]

You are right, but the temperature there was 36 C, 65 C was in full benchmark with all cores at 100% for 20 min.
So the slowdown i was talking it doesn't happen only if pc passes 62 C but even when it's cooler

 

[Deus Gladiorum]

Prolonged CPU overheat damages a CPU, and it sounds like your CPU has been put through the ringer. Additionally, whenever your CPU performs a small task, whether it's opening a new window or something else, just that small action can mean a large spike in temperature. Just starting to play a movie for me causes my CPU temps to spike 10 degrees and then immediately cool, and I have an excellent cooler. This is because there's a delay between when the CPU performs the action which generates heat and when the CPU fan accelerates its RPM fast enough to get rid of this heat. Now, if you consider that I spike 10 degrees on an excellent cooler just starting to play a movie, imagine what that might translate to with your CPU?

To test this, while hardware monitor is open and visible, either open a new window or start a movie and see if the CPU temps spike.

 

[Nertan Lucian]

I know, but i've tested then, and the temperature was running fine, as you see the monitor has a maximum temperature field, so before the benchmark, it was below 50 C .

Also it doesn't explain why now that i removed the cpu and put it back in socket, the pc runs just smooth with a constant temp at 34~38 C
And that's why i want to solve this, so i would never have to unsocket the CPU so i won't damage the thermal compound

 

[Nertan Lucian]

*bump*

 

[Nertan Lucian]

Ok, I was just passing and since then I managed to solve the issue.

The power cable to CPU was burned inside. You couldn't notice from outside, but even the metal was carbonized. I think the thermal paste did some weird connection that drained so much power that the socket couldn't handle. Or i plugged it wrong and it made a spark that burned the socket. Yet the funny thing was that sometimes it worked perfectly and sometimes, when it cooled down (i think) and I restarted the PC, it worked in slow motion.

Very weird effect. To be honest, if I was a physicist, I would study why it acted that way. Basically is like slowing time down, it worked perfectly otherwise, yet only in slow motion. I'm baffled more how sometimes it worked ok and sometimes you got this strange effect ... interesting. Anyway