For me it's a combination of poor voltage stability, high CPU temps because of insufficient radiator heat dissipation and outrageous NB temps that I can't control no matter which orientation, fans and remounts I do with the NB cooler.

I'm ordering a mips wc kit next week, so NB will be watercooled in the not too distant future hopefully.

I'm also going to replace my Galaxy with an Ultra X3 1000w PSU... and it's going to cost me an arm and a leg to import one