I initially used the Brocken v3 I already was using on the 3700 I updgraded from but as a large retailer reduced peerless assassin to £32 in their recent sale I decided to go for that given all the positive review. On Cinebench by the end of 10 mins with the Brocken CPU temps had reached 85C with CCD hitting 90.5 at max. Initial results from Peeless Assasin were disappointing - went to 90C very quickly ... but I'd had issues getting it installed as it didn't seem to fit well. I then realized that the Broken was using an Alpenfohn AM3->AM4 conversion kit I'd got with the Broken (which was originally designed for AM3) and I'd had need to use a mix and match between what the Brocken had used and thew new mounting kit to install the PA. When I realized this I managed to dig out the AM4 backplate from the motherboard that I hadn't been using. Removed the PA - could see from the thermal paste that it had not been in contact with one side of the package - reinstalled the mount with the correct backplate and the PA. Just run cinebench and its topping out at 75 now after 10 mins. So (if fitted correctly!) its doing 10-12C better than the Brocken (and 8C better in the L3). So looks like a good choice in the end!
Are you using both fans with the Assassin?
I got a CoolerMaster ML240 AIO when I upgraded to my 5800X3D, mostly just for looks. I've had a little niggling worry in the back of my head about the pump or something failing, and so I'm thinking of switching back to air cooling. The PA seems like very good value.
EDIT: Just to add, I've set the PBO to -30 in the mobo BIOS so I should be running a touch cooler anyway (hopefully!).
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