i7 4790k very high temps.

The CPU sounds all used up. While you could get a cooler to handle the temps I suggest another CPU.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($333.69 @ SuperBiiz)
Total: $333.69
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-11-13 10:59 EST-0500

CPU's die like all parts. Electrical migration occures but usally it takes about 10 years. Overclocking speeds up electrical migration. The previeous owner must have pushed it to the max for a long time.

KK if you buy another used one be on the look out for for overclocked ones as they are usally used up.

Yup prime95 VERSIONS LATER THAN 26.6 is an issue. Wish you would have posted that earlier.

Because the 4690K runs at 3.9 GHz, has 6 MB Cache without Hyperthreading (i5), while the 4790K runs 500 MHz faster at 4.4 GHz and has 8 MB Cache with Hyperthreading (i7), which requires a significant increase in Vcore, and in turn adversely affects Core temperatures.

Thanks CompuTronix for catching that. +1.

Guys,

Test utilities such as LinX, LinPack, Intel Burn Test (IBT is NOT an official Intel utility) and versions of Prime95 later than 26.6 load your CPU beyond 120% TDP (Thermal Design Power) at default BIOS settings. Intel tests their processors at 100% TDP with the intended default settings specified for motherboard manufacturers. So when the end user is running thermal and/or stability tests, the goal is to replicate Intel's test parameters as closely as possible by using compatible test methods.

This means that when your 88 Watt TDP i7 4790K is installed with the stock cooler on a motherboard with default settings, then Prime95 v26.6 Small FFT's is run, a utility such as Core Temp or HWMonitor should show that Power (Watts) is within +3% of TDP, which is approximately 91 Watts. Of course, the values change when we change BIOS settings and install after-market coolers to overclock our processors, but this shows that our test methods are valid and appropriate.

Prime95 version 26.6 Small FFT's meets Intel's TDP specification more closely than any other utility. Also, Small FFT's is a steady-state workload, which is perfect for evaluating thermal performance and Core temperatures. Just take a look at Section 13 in the Intel Temperature Guide, which I linked above in a previous post. You can see that the Charts show what a steady-state workload looks like compared to a fluctuating workload.

Thermal testing with Prime95 Version 26.6 Small FFT's will give you a valid thermal baseline.

Asus RealBench is excellent for stability testing because it stresses CPU, memory and GPU. Although it runs a fluctuating workload, it also runs your CPU within 3% TDP during peak workloads, but it uses a realistic AVX workload with code from HandBrake, yet provides peak Core temperatures consistent with Prime95 v26.6 Small FFT's.

Asus RealBench - http://rog.asus.com/articles/news/realbench-v2-43-new-version-available-now/ - (Click on "download" shown in bold print).

The problem with this topic is that there's so much confusion concerning Intel's specifications, and thus so much misinformation on the Internet, and so many people using a multitude of haphazard approaches to testing without any solid basis or understanding, that it's nearly impossible to compare apples to apples. This is why I wrote the Intel Temperature Guide. Give it a read.

CT

What do you use the CPU for? I'd test it with whatever tasks you use it for and see if the temps are normal under that load. I switched from 4690k to 4790k and I noticed the i7 uses more power than the i5. I had to get a better cooler just to use the i7 with turbo boost enabled.


While playing Battlefield 1 with:

Arctic Freezer Pro 7 Rev 2 - ~80C at 4.4GHz

upgraded to

Cryorig H7 - 60C and below at 4.4GHz

(I'm pretty sure the low quality Acrtic Freezer wasn't making good contact though.)

**Also, since you bought it used you could try running Cinebench to see how it scores.

@CompuTronix : thanx for all those infos
How about OCCT to stress the system? You're not mentioning it, so I'm wondering... Same as the other softwares?

LeKeiser,

Although OCCT is useful for stability testing, it's not well suited for testing processor thermal performance. There are two tests; CPU OCCT which uses a version of Prime95 later than 26.6, and CPU LinPack. Neither test can provide a valid thermal baseline. I'm also not a big fan of AIDA64 for similar reasons; additionally, there are too many test combinations which many users find confusing.



pipboy 3000,

Proof once again that Prime95 version 26.6 Small FFT's is the proper test for measuring thermal performance, and later versions should not be used. As I suspected, your i7 4790K is fine.

Here's an interesting article from Intel which addresses the Prime95 version issue: Troubleshooting Intel® Core™ i7-4790K / i5-4690K overheating - https://communities.intel.com/docs/DOC-23517

Here's the recommended operating range for Core temperature:

80C Hot (100% Load)
75C Warm
70C Warm (Heavy Load)
60C Norm
50C Norm (Medium Load)
40C Norm
30C Cool (Idle)
25C Cool

Core temperatures in the mid 70's are safe, so just keep it under 80. For Prime95 V26.6 Small FFT's, 60C on an H55 is excellent, which leaves you ample headroom for overclocking.

In our technical world, everything revolves around specifications. So when discussing this topic, it's extremely critical to be very specific. It's not enough to simply say which utility is being used; which version can also be important.

Further, since we get questions from many climatic zones worldwide, it's equally important for Members to include their ambient temperature, which can range from 15C to 35C. Many Members offering answers or troubleshooting advice frequently neglect to ask concerning ambient temperature, and sometimes jump to the wrong conclusions based upon incomplete information. Ambient temperature is a very crucial variable, as all computer temperatures rise and fall with ambient.

Since your ambient temperature is only 1C below Standard which is 22C, If I were you, I would declare victory and have a beer!

CT