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Prime95 Intel Controversy

Alir
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Source: http://www.tomshardware.co.uk/answers/id-3159716/4790k-aida64-cpu-fpu-test-showing-100-degrees.html

 

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This is precisely why I'm not a fan of AIDA64; there are too many confusing test combinations which have no conclusive results.

And yes, it's completely normal to quickly reach throttle temperature when running just the FPU test only!

Although AIDA is useful for stability testing, it's not ideal for thermal testing because of it's fluctuating workloads which produce fluctuating temperatures.

When thermal testing, the goal is to run a utility which will replicate Intel's Thermal Design Power (TDP) as closely as possible, because TDP isn't just a calculated value, it's also a measured value where both must agree.

The only utility which comes closest to replicating Intel's test parameters is Prime95 Version 26.6 Small FFT's, because it's a steady-state 100% workload within 3% TDP that produces steady-state core temperatures.

Do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd through 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.9, run AVX code on the Floating Point Unit (FPU) math coprocessor, which producesunrealistically high temperatures. The FPU test in the utility AIDA64 shows similar results.

Prime95 v26.6 produces temperatures on 3rd through 6th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a significantly larger Die.

Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Use Core Temp to measure your temperatures - http://www.alcpu.com/CoreTemp

Your Core temperatures will test 10 to 20C lower with v26.6 than with v28.9.

Please read this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

CT :sol:

 

Thoughts? I have an i7 4790K (not overclocked) and was looking forward to stress testing it with Prime95 overnight or for a day to check if it's unstable or not.

 

I have stressted my CPU with AIDA64 running just the FPU test. The temps hover around 85 degrees celcius on a Dark Rock Pro 3. 

1) Is that good or bad or bad but normal?

2) The only other problem I think I've experienced is when I run a GPU stress test on that same screen by itself, the CPU clock graphs sometimes dip ALL the way down for a quick moment and then go back up. Why is this? Is this something to worry about? Someone else has experienced this:

http://www.tomshardware.co.uk/answers/id-3123898/aida64-cpu-stress-test-question.html

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I wonder if this post has anything to do with how @STRMfrmXMN may have just fried a 4670K with P95...

Looking at my signature are we now? Well too bad there's nothing here...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

What? As I said, there seriously is nothing here :) 

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I ran it on a 4670K and the voltages went up to 1.5v. Didn't kill it or harm it that I know of.

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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Prime95, AIDA64, and whatever all try to fill the CPU's execution units with something to do. This is an unrealistic test because

  1. It's a rare use case
  2. 99.99 (and some change)% of the programs out there don't do this as part of their normal operation.

These tests are useful to prove two things

  • Your cooling system is good enough to cover a worst case scenario, which may never happen anyway. It's like insurance. You don't want to use it, but you're glad it's there.
  • If it can survive that much of a load, then you can expect it to survive any load. It's like when people say "If you can drive through LA/San Francisco/Washington DC traffic, you can drive through anything".

As for this:

32 minutes ago, Alir said:

2) The only other problem I think I've experienced is when I run a GPU stress test on that same screen by itself, the CPU clock graphs sometimes dip ALL the way down for a quick moment and then go back up. Why is this? Is this something to worry about? Someone else has experienced this:

If all you're doing is the GPU stress test, then there's nothing for the CPU to do. Thus it's idling and thus it'll clock itself down.

 

EDIT: Also there's this regarding the claim that using solder on the IHS had a significant impact

I have a blog! And a list of guides I've posted

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