Thank you LS for the quick reply.
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What heat sink are you using? A better one may be needed. The freebie that comes with CPUs is usually pathetic, should be discarded
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This PC was custom-built by purchasing parts separately. I am using the heatsink (CPU fan??) that came with the CPU. If I have to buy a better after-market heatsink, what would be my most economical yet effective brand and model?
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Which exact i7 processor?
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It is Intel Core i7-4790K @ 4.00 GHz. I did not do any kind of overclocking.
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Sometimes it's as simple as removing the heatsink, reapplying new paste, and re-seating it on the CPU. Cheap paste can turn to powder, and disappear over time. Sometimes CPUs come with decent paste, sometimes not. Any idea what you were using?
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I did this. Removed the heatsink, scrapped the paste and applied new paste and put the heatsink back. But the thermal paste I used is a very cheap one. An unrecognizable brand. [/quote]
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Use procmon.exe (Microsoft Process Monitor) and see what else is using the high CPU.
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I will check this and come back with results.
There is no graphics processor in the system.
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I have an update and still worried. I replaced the stock heatsink with s Cooler Master Hyper 103 (this is what will fit my case). Now the idle temperatures are around 40c and 88-95c while encoding using Handbrake. Are these temperatures safe for the CPU? After installing the new heatsink, the blue screen is not coming though. Something else is at fault? I am not sure how to find out the culprit...
I wasn't sure how to use ProcMon...it's interface was too overwhelming for me.
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An update: I got the CPU and Motherboard replaced in warranty and everything is fine. With the Cooler Master Hyper 103 heatsink, the CPU is running cooler as well.