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Ever heard of being able to run a GPU benchmark for hours, but still crash in a game?

I wonder just how good of a measure running GPU benchmarks like, Unigine Heaven and Valley are? I can run with my GPU at 100% load, not exceed 54-58c for long periods of time in benchmark, but then crash right off of the get go in a lighter, less taxing game...such as an MMO(which seldom uses anything more thna 55-60% of my GPU at all times lol). However, I can be fine in a game like Titanfall, which actually does use 97% of my GPU, full time.

I'm running an R9 280x 6GB. I'm using the same settings on this system, as I had on my previous system with success and around the clock. On this system, I can be good for an entire day of Elder Scrolls Online, but then fire up the computer the next morning, hop into the game and get client crashes caused by(I think) ATICatalyst. I can then take those same settings and run Unigine for hours, solidly and at low temps. Now, I just knocked my voltage down by 7mV's and now I'm smooth again...for now. Bumping the voltage up 5-6mV only seemed to worsen it.

Afterburner works differently with this card as it does with most cards. On most cards you would get something like 1175mV and from there, you can bump it up as high as 1200mV(unless, you extend the voltage rage, which I have never needed to do). Meanwhile, on my card, you only offset mode and you can set to any increments you want between -100, 0(default) and +100. Currently, my card is +56. I was getting crashing at +63, which was a necessary setting on my old PC, as you'd crash with anything less. I'm hoping that lowering has solved my client crashing. I just can't get past having been fine all day yesterday and suddenly get crashing this morning, until having lowered voltages. Now, the difference between my old build and this build is I had Power maxed out at +20 on my old build and only +10 on this one...perhaps it is throttling too much.
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    Synthetic benchmarks are just that, synthetic! lol they can not replicate real-world performance. For example, Furmark "burns in" GPUs, but it only uses 1 CPU core to do it (I regularly monitor temps, usage, etc). However, BF3 will use ALL eight of my cores while maxing out the GPUs.

    In a scenario where 8 cores are being used instead of one, the real-world performance will be different. Not to mention the use of system files, memory, etc.
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