Mine runs at 55-60c under 100% load, overclocked to 3.2, 1.35v, Noctua heatsink. That's with the CPU fan inaudible and case fans on low speed - could get the temps down but there's just no point. Anything below 70c is fine; in reality these chips will go much hotter, but it's not good for longevity or if you're overclocking. Mine was still going at 85c when my CPU fan stopped working.