Ryzen 3900x power cycle when running AVX workloads
I have been posting about this on Reddit and have decided to move this saga to a full thread. Hopefully this will lead to a solution and everyone else having issues can see this.
I waited on launch day to get my 3900x and an x570 Taichi motherboards. I then configured my rig as follows;
4x8gb G.skill Flare X 3200cl14(running bios stock NO xmp)
2080ti FE with EVGA hybrid kit
Corsair H115i RGB Pro
1tb 970 Evo NVME, top slot
Seasonic X 750w (only the 8 pin CPU, the 4 pin is OTW)
Ryzen master for temps
The computer booted fine and passed userbench and some other light workloads. But upon running Prime 95 or cinabench, the entire system would power cycle. I then tried different voltages and overclocks as well as plenty of different ram speeds and timings. Nothing would work.
First HW change: I then took my CPU cooler off and saw that the thermal paste(AS5), rather than spreading to the entire CPU, had stayed relatively in the middle. I wiped it off, and reapplied. I then updated bios from 1.1 to 1.4. This configuration passed cinabench but could not do any CPU overclocking as a power cycle was imminent on any OC. I started paying attention to the CPU temps and noticed upon running P95 (the only one at this point unable to run without power cycle) the temps would immediately hit 95 degrees, while the AIO temps would rise by 4 or 5 degrees to 33/34. This concerned me as it seems that the h115i had a contact issue.
Second HW change. I then swapped the h115i out for the stock cooler, and now the stock settings will "pass" prime 95. Taking a straight edge to the 115i reveals some wobble, or bowing in the cold plate. But with the stock cooler, the temps still hit 95 immediately, but the clock throttles down to 3.9 GHz. My idle temps are around 40c with this setup.
Few questions/ things to consider
1. With the RMA of the cooler I will be able to find out if that was an issue, but has anyone with a corsair AIO run into this? And with the offset chiplets, are there certain brands that are better as cooling potential is not "focused" in the center?
2. Jayz2cents released a video about the stock bios's overvolting, what should I try to get better temps/ stability? Also did anyone have my issues and this is what fixed it?
3. Could there be a variance large enough in the solder where it does not have proper contact with the lid?
4. Could this be symptoms to other issues?
I will post again when I can either get the RMA'd cooler or get a new one with temps/other data.