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Checked the bios version? It can be a bit of a pita the way e.g. asus has organised the bios updates, but I do think it is worth it. Esp. when you upgrade your cpu on the same MB, which is often an option with AMD.
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One of the first things I did after I noticed the issue was update the BIOS. It made no difference.
Real programmers use butterflies
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I have an AMD Ryzen too! 
(AMD Ryzen 7 3700X 8-Core Processor, according to the device manager)
I have no idea how to check temperature or run performance test.. but if you send some link my way I could run the same thing on my machine, as a comparison, if you like?
Caveat, I am using Windows 11, if it makes any difference...
I also have virtual hardware on (for Windows Sandbox!  )
Found it! This thing right? HWMONITOR | Softwares | CPUID (oh this is just the monitoring / temperature thing)
modified 23-Dec-21 5:55am.
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You meant to post it to @code-witch I believe...
"The only place where Success comes before Work is in the dictionary." Vidal Sassoon, 1928 - 2012
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Curiously enough, I left my AMD Ryzen laptop running when I was out for a couple of hours and it had rebooted. I saw "DHCPv4 client registered for shutdown notification" in the Event Viewer and googling this suggested it might be an issue with the temperature getting out of hand, but all I had open was some browser windows and Spotify, not even a game or an IDE.
What app do you use to check the stress test? I can try that later today after I log off and get back with my results.
Cheers,
Vikram.
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It's called HWMonitor by CPUID - the same folks that make CPU-Z
HWMONITOR | Softwares | CPUID[^]
Edit: Now I'm hearing that tool doesn't report temps correctly on AMD systems so I'm trying this one: HWInfo64[^]
Real programmers use butterflies
modified 23-Dec-21 2:13am.
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You might do the stress test, a fast reboot and read the temperature in the bios. Is going to be a bit lower, but it should be accurate
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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HWMonitor says the temperature is in the 45C to 75C  with just some browsers and Spotify running, plus a remote desktop connection into my office PC. No games of any sort running.
HWInfo has two entries called CPU Termal Trip Limit and CPU HTC Temperature Limit, they are both set to 115C 
The processor is AMD Ryzen 5 3550H, I bought it in Aug 2020.
Cheers,
Vikram.
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Thanks! It seems yours gets up hotter than mine under light load. Mine rests 35C under light load, around 60 on moderate load, to 65 under heavy loads.
That's what's getting to me. This CPU isn't being driven near as hard as it can be, and it's underperforming in my benchmarks. I'm guessing at this point that it's a mobo/bios issue. I'm running the latest BIOS which I upgraded to try to fix this, but it didn't change anything. There might be a setting somewhere.
Real programmers use butterflies
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Thanks! I poked at it, and my EDC pegs all red under load, but I guess that's normal.
It hasn't helped the mystery of the underperforming/undertemp issue, but it did show me that the CPU is indeed clocking to full speed under load.
This isn't a big deal - i mean I do wish single core performance was a bit better for long compiles, but mostly this thing is a MONSTER. Even limping along like it is it blows the doors off of a lot of other CPU/APUs.
My main concern is that I may have something misconfigured, and I don't like the idea of undervolting my chip too much, or something like that.
So I'm just trying to figure out the why of this.
Real programmers use butterflies
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Get reminded of an anecdote told by a Computer Science Professor:
In the 1980s, there was an advertisement in a computer magazine that "Our chip is so modern and great that it can complete an infinite loop in 3 minutes."
Reality was that this chip would melt away in 3 minutes while performing the infinite loop computation. So, in essence, the chip completed the infinite loop in 3 minutes.
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I have an AMD Ryzen too! 
(AMD Ryzen 7 3700X 8-Core Processor, according to the device manager)
I have no idea how to check temperature or run performance test.. but if you send some link my way I could run the same thing on my machine, as a comparison, if you like?
Caveat, I am using Windows 11, if it makes any difference...
I also have virtual hardware on (for Windows Sandbox!  )
Found it! This thing right? HWMONITOR | Softwares | CPUID (oh this is just the monitoring / temperature thing)
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That same site has CPU-Z you can use to stress or bench
Real programmers use butterflies
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I saw the bench tab... but.. errmm.. I have no clue what to do, haha, oh well, never mind
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There's a bench button you just click and it does it's thing. Then you can compare it with other cpus.
Real programmers use butterflies
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yeah I have no clue other cpu. I just got a big number and, mm... I guess my CPU is powerful?
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Yeah I'll take a look. I'm not looking at OCing, but I do want to know why my machine is running so cool and underperforming under load.
Real programmers use butterflies
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AMD had always the heat as negative point with their processors, they have got way better in this topic.
I run a Ryzen 7 5800xt with a Dark Rock 4 Pro tower as CPU cooler.
Having played some games and done my standard usage, never heard the CPU fan going high (yet).
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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I do not own a Ryzen but have been using AMD for a long time.
I bought one Ryzen 3 some two years ago for my brother and the temperatures were close to yours while benchmarking.
From the top of my head, if your problem is just with single core performance, it is probably a motherboard configuration issue.
AMD motherboards usually have a configuration to unlock single core frequency. In my 11 year old Asus motherboard it is called "core unlocker".
What it does, when enabled, is to allow the cores to independently increase their frequency (up to the turbo frequency) without increasing for all cores.
It might have happen that, during your benchmark, you probably have that feature disabled (the default) and the CPU thought that it hasn't necessary to increase the frequency of the entire CPU just so that your single task on that single core would run faster.
I suggest you enable that feature for the benchmark only because it can cause (not confirmed) system instability and shorten the life span of the CPU to have it enabled all the time, due to points (location of each core) in the CPU die heating much more than the rest of the CPU.
Alternatively, run more things while running the benchmark so that more cores are busy and the CPU throttles its frequency for all cores.
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In anticipation of heat issues, I chose bequiet dark rock pro 4 coolers for both my itx boards, and love them. Overkill, they keep mine at close to human body temperatures, even in socal summer heat. Huge and spendy, but quiet -- you can check their site to see if it'll fit your board and case headroom. One of them was nicely discounted, snagged from Amazon warehouse; presumably returned by someone that neglected to check headroom before purchasing. Stay cool my friends. ~jm
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I won't be upgrading the cooling while I'm using this mobo. 65 degrees under load is cool as a cucumber. Too cool really, given that my CPU is underperforming @ userbenchmark.com
Real programmers use butterflies
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