VRM temp's are pretty good. When pushed to the max (RX 5700) VRM sees around 80 degrees. This is a touch toasty, but under 90 gets a pass from me.Nice to see that someone uses the Morpheus. It's not common here (most people prefer the Accelero III) and I also consider to use it (360W vs 300W). I've read somewhere, that there are still problems concrete with VRM and VRAM temperatures after replacing the stock cooler, e.g. AMD Radeon RX 5700 + Raijintek Morpheus II Core Edition. I doesn't have an URL by hand, I've read also ReijinTek considers a NAVI edition (like the VEGA edition), but there are still no informations are on there web page. The Accelero III has similar problems expecially with the VRAM, where the 2 cooler on top collides with the main cooler, see e.g. Reddit. What are your experience, especially with the slim 120 below the AIB concerning noise?
I'm currently running core at 1850 (standard max overclock) and don't see temps exceed 65 with fans running at 1200 and fully stressing the GPU. Playing BF5 temps don't really exceed 55.
Memory temps are where I fall down a little bit. I have the small aluminium heatsinks installed which helped temps a little (3-4 degrees) bit but not really a game changing amount. Temps when no memory overclock applied sits around the 75 - 85 mark. I have found a stable memory overclock of 900 which will result in a temp of 90 degrees running multiple loops of 3d mark stress test.
The memory will overclock to 940 and run the benchmarks. A few seconds of cool down following a run is needed otherwise it will crash out as instability at 940 occurs at about 80 degrees.
In my old case I was running 2 12x25 (not slim) fans. Noise bugs me. The slim fans are pretty good, when you use the Low noise adaptor. 1200rpm (max RPM with LNA) is about the most I would want and sat about 6 foot from my telly, whilst gaming I've not noticed it and it's currently something I'm looking out for.
I'm currently trying to re-teach myself CAD (not used since college) and draft a cooling plate to have laser cut from copper which I will try and sort out the memory thermals. If It works I will see if I can run a bulk order and ship some out if there is any demand.
PS. Does anybody know where I can get a CAD drawing of the reference design from?