Your Overclocked Video Card Might Not Be As Stable As You Think

Your Overclocked Video Card Might Not Be As Stable As You Think

Video cards are being used these days for more than just gaming, with frameworks such as NVIDIA’s CUDA and OpenCL allowing general purpose applications to be coded to run on your GPU. If you’re just throwing frame after frame of pixels onto the screen, the odd error or two from an overclocked card is going to go unnoticed. But in an applications like [email protected] where precision is a must?

Image: cpradi / Flickr, licensed under Creative Commons 2.0

These errors will not appear if you use a GPU stress testing program — FurMark, EVGA OC Scanner and the like — but you can test for them using MemtestCL or MemtestG80. Much like Memtest86 does for system RAM, MemtestG80 and MemtestCL make the GPU process a series of repeating patterns, looking for problems in the output.

Both programs run from the command line and can be downloaded from SimTK. Grab MemtestG80 if you have an NVIDIA card, or MemtestCL for ATI cards (thought NVIDIA cards can run OpenCL also). Run the included executable and select “n” when asked if you’d like to submit your card’s details. You can if you like, it just means you have to input some additional information about your system.

The tests will then begin. Errors are logged per test, but a cumulative result is shown at the beginning of each batch, so you can leave the program running overnight.

Note that these tests are aimed at making sure your video card’s memory is running properly. It’s recommended you use it in conjunction with an artefact scanner / GPU stress test to make sure the core clocks are stable. If you find that some games run fine overclocked, but others tend to have issues, this could help find the right memory clock without having to abandon your tweaking efforts altogether.


  • I used these programs, along with a few others like OCTP, after searching for months on how to get my Gigabyte 560ti to work because I was constantly getting TDRs. The programs themselves are sound, but I actually found MSI Afterburner to be the most useful in discerning what the problem was – binned chips that didn’t meet the standards of the 570. I was using crap hardware that was factory overclocked and unstable. VERY dissapointed. I’ll never buy Gigabyte again, or a ‘ti’ model (or the like) again, and steer clear of factory overclocked cards.

    Cards from companies like Leadtek are solid as a rock, and cheaper to boot.

    • Sorry to hear — it’s a pain in the arse when hardware disappoints like that. I had my MSI 560Ti Twin Frozr II die on me very recently about a year after I bought it, but the card is covered a 3 (!) year warranty and MSI’s RMA service was absolutely amazing. Had my RMA number within a day or so, sent it off towards the end of the week and had it back early the next week.

      So be sure to give MSI a look — it’s good to know that you have a great warranty and customer service waiting to help you.

  • I’ve got a 560TI from gigabyte which also TDR’s regularly. It’s only getting worse each time I grab new drivers. I thought it odd as everything Ils I get from them – especially their Ultra Durable range has been top notch. Probably about time I grabbed a new card anyway.

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