I think it boils down to board tuning trace and bios wise. The board I was referring to that pulled 3800 was a aorus master v1.0 with 2x8gb it pulled 3800 on every chip i tested 100% stable.
Swap to DR and it was not stable at all but could boot. then they revised board like 2 more times. makes you go hmmm..
Asrock on older agesas also pulled 3800 then later 3733. the chviii pulled 3733 from launch bios to current with the same 3000 series cpu. I tested every version.....just to be sure.
Both the Asrock and the ASUS were stable with 3733 DR setups as well though.
So i guess it's a combination of alot of things. If you sacrifice something I guess you can get certain things stable or you can tune the board for a majority of configs while maybe losing something.
I gave the gigabyte away for the overall compatibility with SR and DR on CH8 as it had more options available that I could manually set if I needed even though it hit lower speeds.
Right now I can't test vendor to vendor variance as far as board tuning goes as I have 3 ASUS boards all fairly similar well except the 570 I but that should run similar to impact and I wouldn't exceed over an 8 core part in it when testing say prime.
I might pick up an Msi b550 unify X for my vendor to vendor cpu's behave differently testing but i'm not 100% sure I will as I've been waiting to see what other boards might be built electrically for 5000 series.
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