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Old 2016-06-01, 07:10   #1
UBR47K's Avatar
Aug 2015

4416 Posts
Default Nvidia 364.xx drivers returning incorrect results

Has anyone experienced getting wrong residues with Nvidia 364.xx with CUDALucas?
I recently went investigating for the reason why my Titan Z decided suddenly crapping wrong results out and the timeframe coincides with a driver upgrade (I am using Linux here).

Googling around, I found this thread which describes issues not too different from what I am experiencing right now. shows that Nvidia acknowledges some issues with compute with their driver.

I have no way to rollback drivers currently so I can't be 100% sure if my card could have crapped out.

If the driver turns out to be bad, could it mean that the "recent" CUDALucas and mfaktc results be wrong? The driver is already out for a few months now.

One important note: The results I get some of them were correct but quite a sizable portion were mismatchings which turned out to be wrong.

Last fiddled with by UBR47K on 2016-06-01 at 07:12
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Old 2016-06-11, 16:58   #2
mognuts's Avatar
Sep 2008
Bromley, England

558 Posts

BOINC/PrimeGrid is reporting this:

PrimeGrid: Please upgrade your Nvidia drivers!
Recently, Nvidia released driver 368.22 which fixes the serious error introduced with their 364.xx driver. Please upgrade to 368.22 or later, unless you are running Windows XP or Windows Vista.

If you are running the 364.xx or 365.xx drivers, it is imperative that you upgrade to 368.22 or later. The 364.xx and 365.xx drivers can produce incorrect calculation results.

However, if you are running Windows XP or Windows Vista, these versions of Windows are no longer supported by Nvidia's drivers as of 368.22. If you're running XP or Vista, you must revert to an earlier version of the driver (363.xx or earlier).
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Old 2016-06-11, 22:38   #3
Dec 2014

25510 Posts

When I was running CUDAlucas and got Linux updates to nvidia,
I had to recompile CUDALucas or I would get all 0 residues.
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