i8087 instability
 

A short message to request again a triple check for exponent 64 968 877. It is already assigned to user "JisanGain" but, unfortunately, there is no progress (0.0% done). Additionally, if my residue is wrong again, it would mean that my computer is not reliable (1 verified and 2 bad C-LL) ? Therefore, I guess that performing another LL double-check tasks would be probably useless. Is there any thread in this forum to discuss reliability issues or find some advices ?

i8087 instability
 

What are the specifications of your computer -- OS/CPU/GPU/PSU/RAM?

Have you installed temperature monitoring software? If you computer overheats it will cause instabilities. A cheap way to resolve this is to run the computer without a side panel. An AIO watercooling system might be an answer to your problems.

Consider running Prime95/mprime PRP as this has Gerbicz error checking, which picks up errors quickly. LL does not have it.

Thanks for the reply. I did not dare to create a new thread in the forum.

Please find below my computer configuration :

OS : Windows 10 Pro
CPU : Intel Core-i7 12700K
COOL : Air cooler Noctua NH-U12A chromax.black
MTHB : ASUS TUF Gaming Z690-PLUS D4
RAM : Corsair Vengeance LPX Series Low Profile 32 Go (2 x 16 Go) DDR4 3600 MHz CL16
GPU : None
PSU : Seasonic FOCUS GX 650 Gold

Yes ! I use the HWiNFO64 software. At startup or at idle, CPU temperature is approximately 30 or 35 degree Celsius. When running prime95, if I remember correctly, the CPU temperature is near 80 degree Celsius. It is below the TJunction (maximum temperature allowed at the processor die) of 100 degree Celsius. Therefore, it looks good to me. Please note that the CPU is not overclocked, and the system is running with the default BIOS settings.

I should probably review BIOS settings first, and especially some weird and unclear ASUS BIOS options.

You can also run a torture test for a few hours. If you encounter errors. try underclocking memory.

[QUOTE=i8087;604115]if my residue is wrong again, it would mean that my computer is not reliable (1 verified and 2 bad C-LL) ? Therefore, I guess that performing another LL double-check tasks would be probably useless.[/QUOTE]You could switch from LLDC, to DC as PRP with proof. That will show reliability along the way, catch errors, back up and try again, so while you are sorting out reliability, the system can still be somewhat productive.
Assuming prime95, in prime.txt, "WorkPreference=155"

Did anything change on the system between the 1 verified and the other two? Even room ambient temperature?
Good luck identifying and resolving the cause of unreliability. Ram temperature can be an issue too.

You may find some of the large [URL="https://mersenneforum.org/showthread.php?t=24607"]reference info [/URL]collection useful.

Many thanks for your replies.

I’ve just completed another double-check ([URL="https://www.mersenne.org/report_exponent/?exp_lo=65204723&full=1"]65204723[/URL]) and the result is OK (C-LL - Verified). Before running this test, I reset the BIOS settings to the default ones and I disabled XMP feature. I strongly suspect that the XMP memory overclocking caused the 2 bad results. IIRC, XMP was not enabled during the first LL double-check.

Enabling the XMP allowed me to slightly improve the ms/iter indicator but it seems that this feature is finally not safe / reliable.

[QUOTE=i8087;610702]Enabling the XMP allowed me to slightly improve the ms/iter indicator but it seems that this feature is finally not safe / reliable.[/QUOTE]More haste, less speed.

There is no point in running faster if you are running in the wrong direction.

[QUOTE=retina;610703]More haste, less speed.

There is no point in running faster if you are running in the wrong direction.[/QUOTE]And falling over en-route.