i7 8700k 4.77ghz + h100i v2 high temps?

Aug 2, 2018
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So i have my i7 8700k set to 4.77ghz oc with a h100i v2 watercooler with noctua nf 12 fans. I have my vcore set to 1.3. Under full load in prime 95 with just the cpu strees test the cpu reaches 90 degrees celcius, is this even normal? I feel abit dissapointed in those temps considering i have spent alot of money on this. Will i have to buy a h150i instead?

My specs:
asus rog z370-h motherboard
corsair vengence 3200mhz 16gb ddr4 ram
gtx 1080 gigabyte g1 gpu.

arctic silver mx 4 after market thermal paste. My h100i v2 pump is at max and my fans are at 1500 rpm (max).
 
Solution
wolfriderscrew,

On behalf of Tom's Moderator Team, welcome aboard!

If you'd like to know what the above Core temperature scale is based on, then read our Guide. Incidentally, you didn't mention ambient temperature, which can be a huge variable. Just so we don't proceed on false assumptions, ambient temperature should always be stated right up front. Core temperatures increase and decrease with ambient temperature. Since users write to us from all corners of the planet, is it 10°C or 40°C where you live? Standard or "normal" room temperature is 22°C or 72°F.

terry4536,

Respectfully, as you made no mention of the thermal or workload differences between Prime95 VERSION 26.6 and later...
The i7 -8700K does tend to run hot. But the Prime 95 isn't a real world situation. It is more of a torture test and at 90C it isn't great but it isn't throttling either. And it didn't crash.

What are your temps like in your games under load? That is what you should pay most attention to not the stress test.

If your temperatures in the games are under 70 C, then you are fine.
 
Aug 2, 2018
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My temps are at rougly 55-65 degrees gaming, but that is when the load is around 20-40%. It spikes over 70 sometimes during loading screens etc.For example when i play rocket league, the cpu is at 19% load and the cores is 60 degrees. Where can i find a more suitable test program then? idle temps are at 35 degrees rougly.
 


Those are pretty normal temperatures. The Prime 95 stress test isn't for determining your cooling, it is to test an overclock for stability at that turbo frequency. Prime 95 is almost too aggressive in that it can cause damage to your components.

As far as testing, use your most strenuous game as a real world stress test. Scanning for malware will max out your CPU as well.
 
MERGED QUESTION
Question from wolfriderscrew : "i7 8700k 4.8ghz within limits?"







That might depend on who you ask. Typically you don't want to see any temps above 85C, 86C max temp would be okay though if you ask me. Some people tend to go higher just to see how the chip will do, but don't let temps stay above 85C for very long constantly running benchmarks and stress tests. Once you're done playing with your overclocks, be sure to set it to where it won't go above 85C while in normal use, below 80C is preferable.
 

CompuTronix

Intel Master
Moderator
wolfriderscrew,

On behalf of Tom's Moderator Team, welcome aboard!

If you'd like to know what the above Core temperature scale is based on, then read our Guide. Incidentally, you didn't mention ambient temperature, which can be a huge variable. Just so we don't proceed on false assumptions, ambient temperature should always be stated right up front. Core temperatures increase and decrease with ambient temperature. Since users write to us from all corners of the planet, is it 10°C or 40°C where you live? Standard or "normal" room temperature is 22°C or 72°F.

terry4536,

Respectfully, as you made no mention of the thermal or workload differences between Prime95 VERSION 26.6 and later versions, then perhaps you're not yet aware that the workload issue with Prime95 is strictly version specific, which is well known. See the ***Note*** below. Contrary to your blanket statement concerning Prime95, version 26.6 Small FFT's is the best test to validate thermal performance. This has been meticulously researched, tested and proven.

Not all loads are created equal. “Stress” tests can be characterized into two categories; stability tests which are fluctuating workloads, and thermal tests which are steady workloads. Intel tests their processors at a steady 100% TDP workload to validate Thermal Specifications.

Prime95 version 26.6 Small FFT's is ideal for CPU thermal testing, because it's a steady 100% workload with steady Core temperatures, which allows accurate measurements of Core temperatures, and typically runs Core i variants with Hyperthreading and Core 2 processors within +/- a few % of TDP. A steady 100% workload is key for thermal testing so the CPU, cooler, socket, motherboard and voltage regulators can thermally stabilize. No other utility more closely replicates Intel's test conditions than P95 v26.6 Small FFT's.

Utilities that don't overload or underload your processor will give you a valid thermal baseline. Here’s a comparison of utilities grouped as thermal and stability tests according to % of TDP, averaged across six processor Generations at stock settings rounded to the nearest 5%:

Higher TDP tests produce higher Core temperatures. All tests will show 100% CPU Utilization in Windows Task Manager, which indicates processor resource activity, not % TDP workload. Although actual Power dissipation (Watts) varies with Core Speed, Core voltage and workload, Prime95 v26.6 Small FFT’s always provides a steady 100% workload, whether you’re running stock or overlocked.

***Note*** 2nd through 8th Generation i3, i5 and i7 CPU's have AVX (Advanced Vector Extension) Instruction Sets. Prime95 versions later than 26.6 run AVX code on the CPU's Floating Point Unit (FPU) which causes unrealistic temperatures up to 20°C higher due to an excessively high TDP workload, as shown above. Other high TDP utilities have similar results.

AVX can be disabled in Prime95 versions later than 26.6 by inserting "CpuSupportsAVX=0" into the "local.txt" file in Prime95's folder. However, since Core temperatures will be the same as 26.6, it's easier to just use 26.6. AVX doesn't affect Core i 1st Generation, Core 2, Pentium or Celeron processors since they don't have AVX Instruction Sets.

If you’re overclocked and run AVX apps such as for rendering or transcoding, you may need to reduce Vcore and Core speed or upgrade your cooler and case fans so Core temperatures don’t reach 85°C. Many 6th, 7th and 8th Generation motherboards address the AVX problem by providing offset adjustments in BIOS. An offset of -2 (200 MHz) is usually sufficient.

wolfriderscrew,

There's no mention of WHICH of the 15 possible tests involving the CPU was used in AIDA64; any will give different thermal results:

(1) CPU
(2) FPU
(3) Cache
(4) RAM
(5) CPU, FPU
(6) CPU, Cache
(7) CPU, RAM
(8) FPU, Cache
(9) FPU, RAM
(10) Cache, RAM
(11) CPU, FPU, Cache
(12) CPU, FPU, RAM
(13) CPU, Cache, RAM
(14) FPU, Cache, RAM
(15) CPU, FPU, Cache, RAM

That's a lot of variables.

Guys,

This is a complex topic that's poorly understood by the vast majority of users, so when discussing environmental, hardware and software variables and test methods, it's crucial to be very specific. The only way to make sense of the topic is to reduce it to the lowest common denominator by minimizing or eliminating as many variables as possible. This allows apples-to-apples comparisons where results are always consistent and repeatable.

For everyone's benefit, volkgren was thoughtful enough to provide a link to our Guide, which among many other items, explains how to correctly perform a thermal test to establish a valid baseline. It's a Sticky near the top of our CPU's Forum, but here it is again: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Keep in mind there's an overwhelming amount of misinformation everywhere on the Internet concerning this topic, so if you'd like to get yourselves up to speed, then just read our Guide.

wolfriderscrew,

Once again, welcome aboard!

CT :sol:
 
Solution


I'm not really interested in quantitative analysis of the various processor stress tests. If the OP wants to run Prime 95 and footnote all of the system variables that is fine. But it is irrelevant. Because the odds that anyone in the whole wide word is going to run the exact same system configuration and the same version of Prime 95 are very slim.

And that still doesn't give any response to the question at hand. My answer does that for his system and his game. Using his own games to determine whether his cooling is sufficient is entirely relevant.

I am very much used to a testing environment. Quantitative and qualitative analysis do have their place. But I don't see that it is relevant here.
 


I have used Prime 95, Furmark, CPU-Z, Asus Real Bench, and Intel Burn Test. The results on the Intel Burn Test do match my experience. When running it, I ended up discontinuing the test because things were getting too hot. I could literally smell the electronics getting hot. And no I didn't take note of the versions of any of them.

I wanted to try Aida 64, but there was no free trial version.

I do like the 3DMark stress test & benchmark for GPU. They do give you a score relative to similar equipment. I 've also used various versions of Furmark for GPU.