i7 7700K Failed Prime 95 Test

[superbaggand]

So I've just build my first computer:
Asus Prime Z270 A
32 gig G. SKill DDR4 - 3400 (4x 8gig) RAM
i7 7700k
Noctua NH-D14
GTX 1080
Win 10

I have not overclocked it this is still in its standard settings in BIOS. All boots up fine and looks good so I though I'd run some stress tests on it with Prime 95 using the small FFT test over 8 cores. worker 7&8 come back as FATAL ERROR Rounding was 0.4997095989, expected less than 0.4. This happens after a second or so of Prime 95 working.

Overnight I did a memtest for around 8 hours to see if it could be the ram giving it a hard time but that didn't throw up any errors. I ran 2 mem test at once at 2047mb each.

The research I have done shows people overclocking have this problem, but I can find anything on a standard set-up doing this?

Does anyone know why these are failing the test? This computer was built for gaming/ video editing and I don't want it falling over on me.

 

[Ubrales]

Check CPU voltages in the UEFI (BIOS). Check all voltages.

 

[Paul NZ]

Update the BIOS to 0701

 

[MeanMachine41]

Hi superbaggand

Please list the Cooling system you have as it may be heat related. It can still be RAM related even tho your modules past Memtest.
Download CPUID HWMonitor and check your rail voltages and temperatures when the system is under load. P95 will torture your CPU and does not test nor report on other subsystem that may be the cause.
I use AIDA64 for stress testing which is not so harsh and in conjunction with HWMonitor will provide enough info to better identify the culprit.

 

[Lars_16]

Hi superbaggand

Please list the Cooling system you have as it may be heat related. It can still be RAM related even tho your modules past Memtest.
Download CPUID HWMonitor and check your rail voltages and temperatures when the system is under load. P95 will torture your CPU and does not test nor report on other subsystem that may be the cause.
I use AIDA64 for stress testing which is not so harsh and in conjunction with HWMonitor will provide enough info to better identify the culprit.

This is a board issue.

I have the same board, same 7700k and 32GB XMP3600 Corsair CL16 and my system would not prime out-of-the-box.

Here is WHY this is as it is:

Asus by default overclocks the CPU such, that all cores oc to 4.5 in HT, Intel only drives them all to 4.4 and 1 only to 4.5.
Whereas the Voltage applied may be enough for Asus' own RealBench and other's, it is not enough juice for p95.

UP your Voltage by 0.010 or so and it should become stable.


BTW..my tip..if you are still finding your sweetspot. I have have found that raising the VCCIO to 1.3v helped wonders to stabilize the RAM at XMP3600 and higher. Running them at 3866 with same settings as xmp but 1.4v vDIMM.
It passes all benches till 5.0 and 3866 but p95 will get you very high temps, mine goes till 95°C. Think a delidding is needed to cut temps. It passes some but not all tests till 5.2 with Volts I dare to apply without overheating it.

p95 is insane with small FFT's and no delid if you overclock, you directly skyrocket your temps above and beyond past 4.8GHz...at least with my silicon.

 

[The_Staplergun]

Make sure to use prime95 V 26.6. Anyhing after that uses a different instruction set and causes unrealistic temperatures.

 

[mdd1963]

My own 7700K runs no higher than 72-73C (starts at 67C nearly instantly, climbs only to 72/73 within 5 minutes) using NH-D15, same Asus Prime motherboard, but at stock cpu/mem clocks...

 

[Esaelias187]

Make sure to use prime95 V 26.6. Anyhing after that uses a different instruction set and causes unrealistic temperatures.

what is your cpu voltage