New to Overclock.net
Join Date: Dec 2014
Location: Hout Bay, Cape Town, South Africa
I have to say that I've never been a Prime95 fan as I think the heat generated is rediculous. I did however try it with my new 3950X at 4.2ghz using 1.1875vcore and it would run for sometimes 5 minutes, sometimes 10 minutes and on the odd occation 15 minutes before the system switch of and restart. Now I know maybe the vcore is too little, so I tried 1.2, 1.2124 and 1.225 as vcore but Prime95 would restart even sooner. So immediately I started looking at the VR-loop 1 & 2 uder hardwareinfo to check vr temps. Interestingly, the restart would happen the moment those readings are 50c or above, which is way inside aceptable for VRM. I checked the bios and found that I can set the VRM protection temp so I set it at 100c (the lowest I can set it) but still at 50c it would restart. Now understand during these runs the cpu temp is sitting between 80 and 81C so CPU temp is not an issue. I set in the bios VRM protection to 120, most is 125C and now it can go just past 50 but would still restart if over 51C.
Now interestingly I found that another bench that would quickly tell you if you have stability is the full Blender Benchmark and it also uses AVX2. Now I had it pass the full test at 4.2ghz using the 1.1875vcore and I noticed the highest the vrm temp 49c. Yesterday I ran it again, but ambient was sitting in the mid 30C so I quickly saw the VRM temp climb to 49C, I left the machine and 5 minutes later it restarted. So I do belive my processor to be stable. I ran AIDA64 stress test for 1 hours max cp temps around 79 to 80C and vrm temps was sitting at 47 to 48C.
AMD Ryzen 9 3950X
MSI Meg X570 Ace Bios V170
4 x 8GB G-Skill DDR4 3200 CL14 @ DDR4 3600 CL15
Palit Geforce RTX 2080 Ti