sai86
well gaming and downloading games I've never even been remotely close to 90C when I tested the 5900x... are you sure your pump is working properly?
or if you have a proper sensor... what's your flowrate?

Facing a issue just now, even my CPU usage is less than 50%, the clock of active cores and CPU VID is pumping like crazy causing max temp 90C.

encounter CPU Temperature Overheat Error when gaming FFXIV and downloading steam games.
Once I paused  Steam download, the temperature immediate drop to normal.

1st time came across downloading games can make the CPU constant 90C 
MAX VID at 1.5V for all cores is really scary. anyway I can reduce max VID for all cores? previously adjust PBO but with negative value.

Note-this setup is running 2x 360 radiator with 4 intake x 3 outflow fan running @ 1.7k rpm.
*GPU temp remain <40C while CPU remain 90C

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sai86
well gaming and downloading games I've never even been remotely close to 90C when I tested the 5900x... are you sure your pump is working properly?
or if you have a proper sensor... what's your flowrate?

his CPU PPT is 130W eventhough at 30% load, dont think it's a pump issue, feels more like a power plan related.

Both Arctic Cooling Liquid Freezer II 360 and Corsair H150i Elite Capellix never hit 90C. Check your thermal paste and parts. Standard thermal paste application like rice grain and pea size on Zen 2 and Zen 3 does not work properly. You will need more than that because there are multiple chips spread around the IHS.

this is the from the flow meter.

i'm using TristanX balance PPL which serve nicely. even i switch to LOW it still able to hit 90 yesterday
Thermal paste using spread method due to the reason you mention. using Arctic mx-5. i try to screw tighter the CPU WB. i'm sure the CPU block is 100% secure. i'm going to reset the bios/PBO see and try to stress this CPU.

this is the from the flow meter.
i'm using TristanX balance PPL which serve nicely. even i switch to LOW it still able to hit 90 yesterday
Thermal paste using spread method due to the reason you mention. using Arctic mx-5. i try to screw tighter the CPU WB. i'm sure the CPU block is 100% secure. i'm going to reset the bios/PBO see and try to stress this CPU.

This is mine using Corsair H150i Elite Capellix and Kingpin KPx.

From this, it doesnt look like mounting or cooler problem. It's the CPU boosting to 130w ppt problem. look at tristanx's only at 45W ppt. Restart PC also doesnt solve it?

you probably kena the same problem as my ryzen. boosting to 4ghz all core 80C+ just with foobar without CPU load. Baru cakap jer then someone kena the boosting bug

i'll need to reset the CPU block again then. good experience to understand the behavior of this new build.
one thing i regret. normal reservoir > water distribution block 

resetting bios to default now has a much normal behavior. but i agree my  temp has def smth wrong there.
i read the ppt max is also 127 on tristan, unless i read it wrong?

i'll need to reset the CPU block again then. good experience to understand the behavior of this new build.
one thing i regret. normal reservoir > water distribution block 

resetting bios to default now has a much normal behavior. but i agree my  temp has def smth wrong there.
i read the ppt max is also 127 on tristan, unless i read it wrong?

That's the AMD default sai86. It's thanks to reviewers 'comparing boards with the same cpu for benchmarks' without pointing out what happens that manufacturers and especially marketing divisions don't bother sticking to AMD default limits anymore with their out of the box bios configurations.

The 5800,5900, and 5950x have 142,95,140. The 5600x has 76,60,88 as limits.

Another way they love to cheat is with telemetry (hwinfo64 shows this as power reporting deviation)
You could fix these as well if your board has the options but that's not really necessary as of now.

could you provide insight on this "power Reporting Deviation".
from the description itself, it seems like the bios using power is WAY off the mark.

I remember i have to push 90% fan speed for my friend's PC-O11 to cool his rig with RTX 3070 down. His RTX 3070 was choking at auto fan speed.

Try cranking up the fans. My back fan is Noctua NF-A14 IPPC3000 at 2000rpm, H150i is pushing 2400rpm on load.

fan running at 1900rpm for both intake and outflow fans. GPU aint the issue here as even the CPU hit 90C, the GPU still is under <45C.
after using nrw value, i did not encounter that error anymore but the spike causing high temp is still annoying during light load - web browsing,youtube etc.

shall test the 3601 or revert to 3401 bios.

fan running at 1900rpm for both intake and outflow fans. GPU aint the issue here as even the CPU hit 90C, the GPU still is under <45C.
after using nrw value, i did not encounter that error anymore but the spike causing high temp is still annoying during light load - web browsing,youtube etc.

shall test the 3601 or revert to 3401 bios.

The issue now lies between your watercooling parts and the paste I think. Even with Deepcool Assassin III, I've seen only 85C.

Your watercooling setup is very similar to mine, don't think there is any issue there. I'm more incline to believe it may caused by Windows, why i say so bcos previously i have an issue with the idle power always sitting at >200watt, after formatted the problem resolved.

Both Arctic Cooling Liquid Freezer II 360 and Corsair H150i Elite Capellix never hit 90C. Check your thermal paste and parts. Standard thermal paste application like rice grain and pea size on Zen 2 and Zen 3 does not work properly. You will need more than that because there are multiple chips spread around the IHS.

Shoot, I used PEA size on 5950x paired with Dark Rock Pro 4. How did you apply it? Cross?