mfakto: an OpenCL program for Mersenne prefactoring

[AK76]

Originally Posted by kracker

Hmm... how are your thermals?

On another note, I've ordered a R9 285... Will have results by Tuesday/Wednesday.

GPU-Z show 77-80 Celsius and 100% load.

[Cruelty]

Originally Posted by AK76

GPU-Z show 77-80 Celsius and 100% load.

It would be interesting to see full GPU-Z readings - your GPU may throttle not because of high GPU temperature but high VRM temperature. I've had such a problem with HD7870XT while ago...

[AK76]

Originally Posted by Cruelty

It would be interesting to see full GPU-Z readings - your GPU may throttle not because of high GPU temperature but high VRM temperature. I've had such a problem with HD7870XT while ago...

GPU log

[Cruelty]

Originally Posted by AK76

GPU log

I don't see throttling or thermal issues in this log The only issue I see there is the +12V voltage, which according to ATX specs should not fall below 11.4V. Of course you would have to confirm it with some digital multimeter before RMA, nevertheless it shouldn't impact GPU performance since it is running at stock specs.

The other things that come to my mind:

• PCI-E link speed - but I don't think it would cause you trouble even at v1.0 x1
• something else consuming your system resources (Prime95, LLR, PFGW, other?)
• software issues - e.g. messy driver installation (installing new version without prior uninstalation of an old one)
• overclocking issues - try to go back to FSB @ 333MHz and check if it solves your problem. BTW: what is your PCI-E frequency @ FSB=443MHz? Using default multipliers it may be running way out of specs and thus causing troubles.

[Bdot]

I've uploaded another test version to the ftp with improvements for GCN 1.2 devices and for the perftest.

• I now added a GPU type "GCN3" for Hawaii, Bonaire, Tonga and Vesuvius, which should improve "normal" TF speed by ~20%
  Please confirm if you have one of these (Bonaire = HD7790 is just a guess of mine).
• you have sent so many test results to me that I noticed I should have sorted the --perftest output ...
• --perftest now displays mfakto version and GPU info
• --perftest now also shows a nice performance summary for each exponent
• using "OCLCompileOptions=+ -USE_DP" mfakto can now be switched to double precision without changing the GPU type
• there was indeed an overflow bug in the CPU-sieved perftest (only on cards faster than mine )

For cards not in the GCN3 category there should not be a lot of changes - no need to rerun any test. But if anyone wants to run another perftest, then please use this version for the nicer output.


Thank you all for your help.

[kracker]

HD4600 results... Tonga and APU coming later

[NickOfTime]

Originally Posted by Bdot

I've uploaded another test version to the ftp with improvements for GCN 1.2 devices and for the perftest.

• I now added a GPU type "GCN3" for Hawaii, Bonaire, Tonga and Vesuvius, which should improve "normal" TF speed by ~20%
  Please confirm if you have one of these (Bonaire = HD7790 is just a guess of mine).
• you have sent so many test results to me that I noticed I should have sorted the --perftest output ...
• --perftest now displays mfakto version and GPU info
• --perftest now also shows a nice performance summary for each exponent
• using "OCLCompileOptions=+ -USE_DP" mfakto can now be switched to double precision without changing the GPU type
• there was indeed an overflow bug in the CPU-sieved perftest (only on cards faster than mine )

For cards not in the GCN3 category there should not be a lot of changes - no need to rerun any test. But if anyone wants to run another perftest, then please use this version for the nicer output.


Thank you all for your help.

Hmm, I believe my Radeon 260X is bonaire, I test that as well as my 290x again...

[NickOfTime]

Originally Posted by NickOfTime

Hmm, I believe my Radeon 260X is bonaire, I test that as well as my 290x again...

testresults15pre5_260x_bonaire.7z

[NickOfTime]

And the 290x. Since I am reconfiguring one machine one card is running at 8x @74C and the other at 16x @64C for pcie...
testresults_290x_pciex8.7z
testresults_290xpciex16.7z

[kracker]

Well... this is depressing. I reinstalled the driver about three times now for my new 285, the driver crashes while running mfakto's test...

EDIT: Running the "regular" 0.14 mfakto on regular work doesn't crash... Weird.

[NickOfTime]

Originally Posted by NickOfTime

And the 290x. Since I am reconfiguring one machine one card is running at 8x @74C and the other at 16x @64C for pcie...
Attachment 11932
Attachment 11933

Hmm, I tried running it concurrently on my 290x's in the 70M 74bit range and I start seeing fluxations in Ghz/d , GPU core clock and GPU utilization resulting what looks like overall throughput of 900 ghz/d instead of the potential 1450 ghz/d...

On 14 I am have 100% utilization but the overall throughput drops by 25ghz for both cards (525ghz to 500ghz) so 1000ghz/d of potential 1050ghz...

Are we hitting a memory / bus bandwidth? Asus z87-ws I7-4770S 8G DDR3-1866