How are you guys getting sub 50C temps hashing 2k on Vega 56s? Are you blowing freezing air on them or something? I'm at 68-70C doing 2k at room temperature and with a 120mm 5 fan array cooling.
I am using the Raijintech Morpheus II coolers. I will say this about Vega thermal grease after cracking 9 of them apart. Only one seemed to have good, fresh thermal grease. The other 8, which were brand new, had dried crappy looking thermal grease; sometimes it was applied quite thick, sometimes it was very thin and did not quite cover the GPU/HBCC.
This is very different from when I was opening up RX 480s. The thermal grease was uniformly very good across every batch that I opened.
I suspect that some of the different experiences are related to sub-part thermal grease, or how it was applied. But taking apart the Vega is not completely simple. PM if interested.
And it is cold here in NY, which helps.