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Worried that my CPU/GPU are running hotter than they should. Results via CPUID HWMON and GPU-Z after a few runs of 3DMark Firestrike, Unigine Heaven 4, Unigine Valley.

CPU: Core i5 6600K overclocked to 4.3 GHz, voltage is default to 1.2V. Gets up to 59 C with an Asetek 510lc liquid cooler.
GPU: R9 390 overclocked to 1040 core/6120 memory, voltage at default 1.225V. Gets to up 75C with the PowerColor PCS+ cooler which spins from 75-83% depending on the load. VRMS 65-70 C.

Both of those temperatures are within spec. Remember that the stock 290 and 290X coolers kept the GPU around 95C, and that most Intel CPUs are rated to run at close to that temperature, too. 59 and 75 are nothing to be worried about, unless one or the other's cooler is getting too loud for your tastes.

^
Pretty much

Also, try playing with power tune on the 390. On the 290x cards some people could cut power by 20% and more without losing performance. Which should help with heat, and save you a very small amount of currency.
Although a cut of 10% or so is more realistic.

viewtopic.php?f=3&t=109936

NoOne ButMe wrote:

^
Pretty much

Also, try playing with power tune on the 390. On the 290x cards some people could cut power by 20% and more without losing performance. Which should help with heat, and save you a very small amount of currency.

viewtopic.php?f=3&t=109936

Adding on to what NoOneButMe said adjusting Powertune should allow the fan speed to be less aggressive, might help out the VRM temps too.

My target is to stay under 70C on CPU, and I feel that's still well on the safe side. Skylake 6600k/6700k seem to hit 4.5 ghz with relative ease, then quickly starts hit a wall around 4.7-4.8. YMMV and all.