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I run an i7-2700K on a DZ68BC, which I've assembled about a year ago. I've used the stock Intel fan without additional thermal compound and it worked flawlessly ever since.

I've had the Intel Desktop Utilities installed ever since I set up the machine. Lately, I've been seeing a lot of these:
enter image description here

I grabbed a can of pressurized air and cleaned out the inside of the case. Didn't do anything in regards to temperature.
So I figured it couldn't hurt to replace the thermal compound between the heat sink and the CPU, so that's what I did. And here's how it looked:

enter image description here enter image description here

So, I cleaned it all up with alcohol and applied new thermal paste:

enter image description here
enter image description here

So, after this whole ordeal, pretty much nothing has changed:

enter image description here

Before I replaced the thermal compound, I would get temperature reading of >90°C in the BIOS, after replacing it, I got a reading of 78°C.

In the OS, the temperatures are much lower, yet, still concerning. Under moderate load it will jump to the 85-90°C area rather quickly.

Why is the CPU suddenly getting this hot and how should I remedy this situation?

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closed as too localized by Indrek, Nifle, Siim K, Dave M, TFM Feb 18 '13 at 23:50

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Can you try a different CPU cooler, either from Intel or other vendors, and check the temps? – afzal Jan 30 '13 at 15:28
@sabrefresco: I don't have any replacement parts I could try at the moment. But I'll look into it – Oliver Salzburg Jan 30 '13 at 15:29
Can you check your fan speed, using Speedfan or any other program or even from the BIOS? At temps close to the T-case, you should have around 2500-3000rpm. With you current temp (78C), I would expect it to run at more 2100rpm. – afzal Jan 30 '13 at 15:35
@sabrefresco: When running Prime95, I get these readings from Desktop Utilities: I've never seen it go beyond 2400rpm. Maybe the stock fan can't even go any higher. I also ordered an EKL Alpenföhn Himalaya which should be delivered in the morning. I'll report back :) – Oliver Salzburg Jan 30 '13 at 16:22
I wonder if your fan is running at the correct speed while under a 50% load. Of course going from a value higher then 90°C to 78°C is a enough of difference to make what you did worth awhile. Do you notice any noise with the stock fan that sounds different? The temperatures you are getting at 30-60% load should really concern you. Those temperatures at 100% load could in theory be accepted depending on the length of time you were under that load of course. As for the RPM of a INTEL stock fan it can go up over 4000 RPM – Ramhound Jan 30 '13 at 16:28
up vote 2 down vote accepted

So, today I've replaced the stock Intel heat sink/fan with an EKL Alpenföhn Himalaya.

enter image description here

Now, shockingly, the temperatures are much lower:
enter image description here

Still a little high though. I no longer get any annoying temperature warnings, so I'm happy for now. After replacing the thermal compound as well as the heat sink and fan, I really don't see what's left to do. Especially given that I didn't see any cause for the sudden increase in heat.

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