How to stability test GDDR overclock?

[czarspuppet]

I can say with certainty that most GPU stability testing tools only check memory indirectly- Like a CPU burn in with small data sets. With 2 or 3 GB of memory, the chances of an indirect hit at pretty low. You can see the results of this in games that have high graphics memory usage being far more sensitive to bad overclocks than tools with virtually no graphics memory footprint.

So does anyone know a method to test the memory stability directly with a simple graphical test? Hell it doesn't even have to be graphical.. Load the cores for relative temp and clocks then swap 2 GB with the ram a million times and check for changes.

(a directcompute benchmark with large data sets is probably the right answer but I'm not familiar with any)

[K404]

.... playing a game at high-res is MUCH more fun

"Stable" is running whatever software you run, without problems. Run the software that will benefit from the extra MHz

[CrazyNutz]

Video memory stress test: http://majorgeeks.com/Video_Memory_S...st__d5896.html

It's old but i just tried it and it worked on my gtx560ti 448 core. However I had to pass it my vram size on the command line "vmt.exe 1248"

[[XC] Oj101]

What about OCCT's GPU Memtest?

[BeepBeep2]

GDDR5 has error detection so usually when performance drops off. If I understand correctly, when an error is detected the data is resent on a different clock until it is correct. Therefore you waste clock cycles and performance decreases.

3DMark06 minus CPU tests would make a good stability tester but it requires you to run multiple times, check variation of scores etc.

[CrazyNutz]

I pretty much just keep vram stock now days. I simply do not see much of an improvement overclocking it anymore. Plus trying to push it too high can hold your core/shader clocks back.

[czarspuppet]

What about OCCT's GPU Memtest?

It's CUDA based.

[czarspuppet]

*bump*

Game-style benchmarking is quite far from the right answer, although rendering isn't completely out of the question (eg, furmark or OCCT GPU test). OCCT's Memtest (CUDA) method is relevant but not applicable to ATI. Any other suggestions?

[dasa]

it depends on the card
with my gtx480 fur could run with the memory ~200mhz faster with no glitches than the farcry 2 benchmark which for those cards was the quickest test i found for detecting memory errors
but my 7970 is completely different and testing for a stable memory speed so far has been largely trial and error
at this stage 1809mhz doesnt seem to bad but at 1850-1900mhz i start noticing the odd artifact in games\benchmarks

[[XC] Oj101]

Ah, my mistake. The last time I had an ATI card, OCCT didn't have the graphics card MemTest so I didn't know it requires CUDA. I'm sure someone here can port it to OpenCL