mfaktc: a CUDA program for Mersenne prefactoring

[Mark Rose]

Originally Posted by kriesel

And thanks much for the report and the various followups. I had been contemplating an RTX2080, which I see in Mark's posted link is also affected. Hopefully NVIDIA gets things straightened out soon.

I wouldn't hold back from getting one, but you may need to exchange it, that's all.

[kriesel]

Originally Posted by Mark Rose

I wouldn't hold back from getting one, but you may need to exchange it, that's all.

It's not clear what the percentage with early failure is. Any idea or data? I thought since it's shown up early after their release that the percentage is significant. The title and article you posted a link to said high numbers.
It linked in turn to https://www.digitaltrends.com/comput...s-cards-dying/ which indicates Founders Edition high numbers, and also some Gigabyte and ASUS cards.

Anecdotally, there are folks on the forum with 2 of 3 cards failed, or 2 of 2. Failures are generally in under a month, frequently under a week, some as little as a day. RMAs take longer than that short lifetime. Replacements are also failing. Generally, I like NVIDIA hardware. But this sounds bad. https://forums.geforce.com/default/t...sively-die-/2/

[xx005fs]

Originally Posted by kriesel

It's not clear what the percentage with early failure is. Any idea or data? I thought since it's shown up early after their release that the percentage is significant. The title and article you posted a link to said high numbers.
It linked in turn to https://www.digitaltrends.com/comput...s-cards-dying/ which indicates Founders Edition high numbers, and also some Gigabyte and ASUS cards.

Anecdotally, there are folks on the forum with 2 of 3 cards failed, or 2 of 2. Failures are generally in under a month, frequently under a week, some as little as a day. RMAs take longer than that short lifetime. Replacements are also failing. Generally, I like NVIDIA hardware. But this sounds bad. https://forums.geforce.com/default/t...sively-die-/2/

Honestly those artifacting looks like GDDR6 artifacting because in my personal experience, when the GPU core crashes it won't artifact first, it will just straight up freeze and turn into blank screen, then the driver might auto restart the device or not depending on how badly it crashed (i dunno how the autorestarting device thing works as it usually restarts with nvidia gpu not with amd gpu). Try to underclock the memory to as low as possible as trial factoring is not memory intensive at all.

[petrw1]

Overall my GTX-980 GPU is giving me about 1 factor per 100 attempts which is about right.
But in the last couple weeks I have completed over 500 TF 73-74 in the 5xM range without a factor.

Recently I ran mfaktc.exe -st and it passed all tests.
Is this enough of a test to trust the card is working and just having a streak of bad luck?

[chalsall]

Originally Posted by petrw1

Is this enough of a test to trust the card is working and just having a streak of bad luck?

I wouldn't worry about it too much; such gaps are relatively common. But if you want to be absolutely sure, why don't you run a few jobs where people recently found factors at the current DCTF wavefront:

Factor=56582819,73,74
Factor=56579363,73,74
Factor=56579071,73,74
Factor=56572361,73,74
Factor=56567509,73,74
Factor=56573833,73,74
Factor=56553979,73,74
Factor=56549137,73,74
Factor=56548663,73,74
Factor=56545807,73,74

[petrw1]

Originally Posted by chalsall

I wouldn't worry about it too much; such gaps are relatively common. But if you want to be absolutely sure, why don't you run a few jobs where people recently found factors at the current DCTF wavefront:

So because I like to be sure I reran 14 in that range that were TF65-66 (took about 10 seconds each). I found all the factors listed PLUS for exponent 56548031 I found:
--- The factor listed
--- The additional factor TJAOI found
--- AND another factor even TJAOI missed
https://www.mersenne.org/report_expo...6548031&full=1

Then I ran 5 in the TF73-74 range and found all the factors listed.

So I now am going to believe my GPU is working but I'm in a factor funk … OR … Chris subversively assigned me only exponents without a factor

[petrw1]

Originally Posted by petrw1

.

So I now am going to believe my GPU is working but I'm in a factor funk … OR … Chris subversively assigned me only exponents without a factor

Found a factor via TF finally

[petrw1]

Originally Posted by petrw1

Found a factor via TF finally

And another 8 hours later

[Mark Rose]

Originally Posted by petrw1

Chris subversively assigned me only exponents without a factor

He does this to me all the time

[chalsall]

Originally Posted by Mark Rose

He does this to me all the time

LOL... But seriously, apparently I do it to myself as well; out of the last ~450 runs I've only found two factors....

[kladner]

Hmm. GPU72, 1000 results, sorted by work type. All are either LL or DC TF.
1000 Assignments completed. ‡ 26 Factor(s) Found!!!.
2.6%? I know this a lament about dry spells for factors, but how does the period in question compare to the users' overall statistics? I have certainly felt parched, at times, but I generally run ahead of projections for TF. At one point, quite a while ago, I had a startling excess of factors in DCTF. This peak was subsequently subdued by very slow periods, which didn't quite make it to Drought status.

Currently, my DCTF efforts are creeping up on projections. LLTF has a comfortable margin above. These too shall pass.
EDIT: Eek! I just looked at the completion dates. The attached are the first and last few results of the 1000 I have been referencing. They span late 2011 to early 2012. That is a bit early for me to have anything GPU but my faithful first: Gigabyte GTX 460. However, I did find out pretty quickly how hard I could push that little card.

My most recent 1000 completions turned in 11 factors.

When yer hot yer hot
when yer not yer not