Which cooler

In theory it should be fine. The 3900x has a stated TDP of 105W whereas this can handle up to 120W.

You can always add another fan to it too if you wanted to boost the performance a bit.
 
The TDP is 200W on the Dark Rock 4, so it will be fine.

As for the Dark Rock 4 Pro, it's a great cooler and easy to install and it does a excellent job at keeping my 3800X cool. Also if you look around you can get it for just a few pounds more than the Dark Rock 4 from here ;)
 
AMD's TDPs are more honest than Intel's and without manually changed settings Ryzens won't ever be pushing 200W under full load.
(max peak toward 150W)

Scythe Mugen 5 would be another same level cooler at better price with full memory clearances.
BeQuiet hasn't mastered the dark magic of making offset fin stack and fan protrudes into space of one DIMM slot.
Though at the moment only slow fans equipped PCGH is in stock with lower than standard version max cooling performance. (but also lower max noise)
https://www.overclockers.co.uk/search?ssearch=scythe+mugen+5
(Arctic P12 would be good replacement)
 
AMD's TDPs are more honest than Intel's and without manually changed settings Ryzens won't ever be pushing 200W under full load.
(max peak toward 150W)

Scythe Mugen 5 would be another same level cooler at better price with full memory clearances.
BeQuiet hasn't mastered the dark magic of making offset fin stack and fan protrudes into space of one DIMM slot.
Though at the moment only slow fans equipped PCGH is in stock with lower than standard version max cooling performance. (but also lower max noise)
https://www.overclockers.co.uk/search?ssearch=scythe+mugen+5
(Arctic P12 would be good replacement)
Thanks mate I like the price of them better :D
 
Thanks mate I like the price of them better :D
Scythe lacks the marketing hype brand/muscle of many brands, but has some very good products with very high bang per buck.
(just like Thermalright)
Like how raved about Noctua NH-U12A is, while costing twice the Mugen 5 for same level performance and doesn't even come bundled with proper screwdriver for installing it...
 
Scythe lacks the marketing hype brand/muscle of many brands, but has some very good products with very high bang per buck.
(just like Thermalright)
Like how raved about Noctua NH-U12A is, while costing twice the Mugen 5 for same level performance and doesn't even come bundled with proper screwdriver for installing it...
Thanks I'm going to order one of them can they be put on whilst motherboard in case or has it goto be installed with motherboard out
 
Thanks I'm going to order one of them can they be put on whilst motherboard in case or has it goto be installed with motherboard out
Mugen 5 uses default backplate of almost every AM4 board:
ftp://ftp.scythe-eu.com/Manuals/CPU-Cooler/Mugen-5-Rev_B.pdf
So as long as there's some hole in "motherboard tray" of the case from which you can make sure backplate doesn't fall of when detaching stock heatsink mount, motherboard can stay installed.
(lots of cases have long hand hole for that)
 
Mugen 5 uses default backplate of almost every AM4 board:
ftp://ftp.scythe-eu.com/Manuals/CPU-Cooler/Mugen-5-Rev_B.pdf
So as long as there's some hole in "motherboard tray" of the case from which you can make sure backplate doesn't fall of when detaching stock heatsink mount, motherboard can stay installed.
(lots of cases have long hand hole for that)
Yes case has the hole should have said thanks for your time and advice I shall order it now thanks again
 
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