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Yeah true, in gaming the Mugen 5 is quieter and spins slower because lower power used compared to stress test.

Oh ok this explained very well, like the Mugen and MA410P in 1200rpm, Mugen does better, if max fan speed, two are same? Then maybe I wasted my money to do this upgrade

Actually the temp difference between the heat pipes are so big, like you are touching hot kettle vs some other surfaces in room, so there is no need to use temp probe. I simulated the GPU to run in same TDP as the CPU using FPS cap in Heaven Benchmark, also did fan speed cap making the GPU to run as hot as CPU, the GPU heat pipes are still way hotter than the Mugen's one.

My chip does 145w package power when running small FFTs with AVX stress test. The Mugen (6 heatpipes, thicker body) with fan speed around 1200rpm does 79c in 24c room temp with delta of 55c, if the fan in 3000rpm it drops 3c. The MA410P (4 heatpipes, thinner body) with max fan speed did 77c and that is only 1c more than Mugen in same max speed. I thought the cooling performance of Mugen will be a lot higher than MA410P because of its size? but turned out only 1c difference, so this does really make me suspect if the Mugen is working 100%. Thermal conduction between CPU and heat spreader could be a problem also. As the two coolers show almost identical results and the CPU is 1.5 years old.

But this doesn't explain why my GPU heat pipes are hot to touch when on load compared to Mugen's one. The location that I touch on the heat pipes is near to the CPU before the aluminium fins, not the top of the cooler.

But when I disassemble the cooler I found the thermal paste was evenly spread. I doubt I am having bad cooler that their heat pipes are not connecting the baseplate properly. However it is still not as bad as it will goes up to 100c, so I really need Mugen 5 users to clarify is the heat pipes behave normally or not.

Nope, I peeled it off, and I repasted 4 times, still the same.

Rear or top? But if I do the test with side panel off really doesn't make a difference. The problem is why the Mugen 5 heat pipes near the baseplate are cold to touch when CPU on load, is it behave like this or I just got a bad cooler?

Exhaust. The 3 fans in front are intake.

Repasted with Cooler Master MasterGel Pro came with MA410P that just used not more than half a year, it does much WORSE than the 1.5 years old Noctua NT-H1, 3c increase. So the paste is not the issue, but the heat pipes are still cold to touch, any idea?

The airflow of my case is very good as it comes with full front mesh cover, almost no difference with side panel off for both CPU and GPU temps.

Around 46 dBA when on max speed but thats only happen when I am doing stress test. Drop the fan speed to same speed as the stock fan 1200rpm, temperature increased to 79c, didn't do the same on Cooler Master so idk its temp on slower fan speed.

I installed a brand new Scythe Mugen 5 Rev.B paired with Noctua iPPC 3000 RPM on my Ryzen 5 2600 OC 4.07 GHz 1.312v, but it does not do well as the reviews claim. Previously using Cooler Master MA410P with the same Noctua fan recorded 77c, the Scythe do only 76c, only 1c difference, both are tested in same 24c room temperature and fans are on max speed. Both coolers are applied with Noctua NT-H1 thermal paste, however in today the paste has been stored for 1.5 years after first use. Could it be the problem? as Noctua claims it can store for 2 years. I have uninstalled the cooler once and found the paste applied is evenly spreaded. What I think for this new cooler does not work properly is because its heat pipes near the baseplate are cold to touch when CPU is on load! As compared my GPU heat pipes are hot to touch even only in 70c. Can Mugen 5 users clarify about this? I have no extra alcohol to clean the old paste so I posted here to get opinions before I buy it tomorrow. Thank you.