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I'm running a similar set-up as you (iBuyPower Valkyrie CZ-17 base) with the 1.025V unlocked vBIOS. I also have difficulty maintaining stability in situations where both the CPU and GPU are stressed to their max. I haven't played Planetside 2, but late-game Civ 5 and Total War often bring my CPU to 100%. The only thing I've found to help is throttling back on voltage. Some monitors have detected voltage spikes when the mobo tries to manage at that level. I also suspect I may have damaged a GSKILL RAM a few months ago in the process. You may want to run some hardware tests occasionally to see if any other peripheral hardware issues are cropping up. Good luck.

Long time no see. I've been using this method for a while now and It has been working great. I'm running an MSI GT70 0NE with an i7-3630QM. I'm using the 1.025V unlocked VBIOS and have a straight up +209 core/+450 memory OC in Afterburner(which matches the suggested boost frequencies). I've ran both the latest drivers(which I'm currently on) and old 347.52(which I used to see if Kepler was indeed downgraded in perf, to nobody's surprise it wasn't). However, I've noticed a problem in one title - Planetside 2. It happens with both Shadowplay on or off, but seems to happen more frequently . I run ThrottleStop whenever I play, which maxes my CPU voltage at just below 1.1. PS2 is very CPU heavy. It's the only game that truly maxes out my CPU usage. On occasion(most often in very CPU-intensive moments), my game momentarily freezes and the screen goes black. The freeze lasts for around five seconds after which I get an absolutely random previously rendered frame(that could be what I was seeing on the screen 5 minutes ago) after which my game unfreezes and my GPU works normally(I haven't checked the GPU clocks after this happens though), except for Shadowplay, which turns off(red line over the indicator) and I need to restart the game to have it work again. Neither my GPU nor my CPU are overheating(GPU maxes at around 70 degrees centigrade, CPU at 82). I don't crash in regular benchmarks(Heaven, Firestrike), but I ran Furmark once and it seemingly bricked my PC for 5 minutes after which I coul turn it on again. I have never changed my power brick. The only guesses I have is that I'm either using too much power or that there is some edge case driver issue. That or my GPU is dying. Anyone else experience something similar?