Is this Normal during stress test??

[JPStone]

Stress testing my Ryzen 7 1700 with Prime95. CPU overclocked to 3.9GHz on a msi B350 Tomahawk. I use a Corsair H55 AIO to cool the CPU and have 4 120mm blower fans and a Nactua NF-A9 90mm exhaust fan in ATX Mid-Tower.

 

System is stable and CPU and package temps stay nominal during stress testing. The one thing I might have concern about is the MoBo temp which reaches or exceeds 80C. I always shut the test down before it hits 90C and never have issue with that kind of temp with regular use, even during gaming. Just wondering is that a sign of inadequate cooling? Unfortunately I do not have a case with fans blowing down onto Mobo but have good airflow otherwise.

 

Also how how would the MoBo have to get before the solder starts to liquefy?

[JJ48_24]

Strange I have a 1800x and an air cooler and I am oced to 3.95 I have no problems.

[Biggerboot]

Sounds like the VRMs.  It's not uncommon for your board it seems: https://forum-en.msi.com/index.php?topic=286453.0

 

There doesn't seem to be a clear answer on what's normal for VRM/mobo temps, or if you'd see it in the real world.  Some folks in the thread decided to get clever with their VRM cooling though.

[TheRandomness]

The MOSFETs making up the VRMs can run up to 120 C without issues. However, don't let them go above that, as they'll thermal runaway and die.

[Emberstone]

VRM temps are why it's been suggested to stay away from the lower end B350 boards like the Tomahawk if you're considering overclocking an R7. There are a few B350 boards out there that are decent enough for it, like the Asus Prime B350-Plus and Strix B350-F if you've got a decent airflow setup in your case, but most B350 boards aren't good enough for it without being pretty toasty.

[seon123]

There isn't really an accurate way to measure the VRM temps without external sensors. With the crappy VRM on the MSI B350 boards, you shouldn't really be overclocking a Ryzen 8 core. 

[JPStone]

Well its been holding up and with more research on my part seems like the temps are not as insane as I first thought. Many run same board well over 100C during stress test (probably not doing any favors to the lifespan of the board but it handles it without frying it). Also, Greg from Science Studio posted a video where he Overclocked a 2nd Gen 2700X on a B350 Tomahawk and was able to do it stably. I think at least part of the problem is my case design and choice to go with AIO over Heat Sink and Fan cooler. I have a light airflow across the board but no direct airflow onto the board...  Maybe this board wont last forever but if I get a year or two out of it ill happily replace it with a new one and hopefully a new CPU to go with it. 

 

My chief complaint now about this board is the inability to use my RAM at its full rated speed. I had to bump the DRAM voltage and trial and error the timings to get even the XMP 1 profile to pass POST @ 2400GHz and forget about 2666Ghz but that is a known issue.