CPU temperature during Prime95 stress test

[ESimo3]

I recently purchased a Core i5-4590K 3.5Ghz. I am using it with the stock heatsink/fan, but I did remove the stock thermal grease and used Arctic Silver 5 instead. I am using an ASUS utility, Dual Intelligent Processor 4, to measure CPU temperature. At idle, it is 30C. I stress-tested with Prime95, using Small FFT and also the Blended test, and in both cases, my CPU temp hit 70C within a few minutes, so I shut the test down. I had the CPU fan running at full speed, which was about 2000 RPM. Does this indicate that I may have applied the thermal grease incorrectly, or attached the heat sink incorrectly? I've read that a good PC should be able to handle Prime95 for several hours. Do I just need to replace the stock HSF with something better? Thanks!

[ESimo3]

Correction, it is a 4690K.

[Allan_J_Intel1]

Thanks for joining the Processor community.

The stock fan heatsink will do just fine for your processor model. Did you run Prime95 with stock thermal paste? Did you get different temperature readings with stock thermal material?

If you need to order Intel thermal material, you can use our Web Ticketing system to do that.

Online warranty: https://servicerequestmgmt.intel.com/webticketui/emailpage.aspx Service Request Email

Check the following URL for some tips to prevent overheating: http://www.intel.com/support/processors/sb/CS-029426.htm Processors — How Do I Know if My Computer is Overheating?

Allan.

[ESimo3]

I did not take any measurements with the stock thermal paste. Within a few minutes, Prime95 took my CPU to 74C, which is above the recommend limit for Tcase so I shut the test off. Does this mean that the processor is defective?

[Allan_J_Intel1]

It does not exactly mean the processor is defective. It might be BIOS temperature readings or even the artic silver paste that is why I mentioned about requesting new Thermal Interface Material (TIM) from Intel.

Allan.