yeah usage on everything is an issue, im running
CPU - 4790k @ 4.5Ghz
GPU 2x MSi 6G GTX 980 Ti @ 1700Mhz core clock, & 3605Mhz memory
RAM - 32GB (4x8GB) G.Skill ares 1600Mhz
all on a water cooling loop, and even @ 1080p all settings on highest but no AA, blur or bloom, my entire system was cooking, CPU reached 89 celcius, both GPU's hit 85 Celcius, even the water temp went upto 67 Celcius, and my system power usage went as high as 610.7Watts. although playing for 4 hours at this point, but even than GTA V @1080p with extended settings maxed too, didnt use that much power nor did it cause any temps to go over 60 celcius. also average room temp is 13-16 celcius (its 9 celcius right now as i left the windows open over night.)