I have a 3930k watercooled as well and that sounds a little high at stock clock/voltage. I have my CPU at 4.7 OC, cannot remember the voltage, but my max heat at full load is about 75c, this is usually after about 40-60min of prime95. On occasion it spikes a little higher, but never over 80c that I can remember. It has been a while since I ran prime95 on my CPU. Glad to see your results with water. I received my block the other day, but I also ended getting a second Titan XP and ordered a second block with the backplates. Hopefully, MSI will release that Afterburner Beta that Guru3d was using to add voltage. With Water, I am sure we can push them even farther, but hearing your results is great to hear.