I have an ASRock X370 Killer Motherboard with latest 2.00 BIOS.
Replace previous Corsair Vengence LPX 3000C15 RAM [CMK16GX4M2B3000C15] with Corsair Vengence LED 3200C16 RAM 2x8GB sticks [CMU16GX4M2C3200C16].
Previously, the LPX 3000C15 Ram couldn't go above 2400C14.
This new LED 3200C16 can reach 2933 with C16 timings but still not able to clock at 3200. 2933 is not too bad, happy with it.
Overclocked my R7 1700X to 3.9 Ghz @ 1.35V stable.
Here are the results for Cinebench and CPU-Z.
Very similar results to your 3.9ghz 1700X for Cinebench.
I am currently using simple AIO ID-Cooling Frostflow 240L with included fans...
Idle temperature is at 50°C.
Stress with AIDA64 for 10 mins, the temperature is at 90°C.
These numbers are before +20°C offsets