Here is first review of a RTX 3080 FE in a sandwich style SFF case : in NZXT H1 :
As expected, it's a massacre : FE RTX 3080 becomes very hot (87°C) and starts throttling.
What is sure is that RTX 3080 is really a power angry card, way more than RTX 2080 ti.
Used to run Arch Linux all the time for all things with Team Green. Radeon drivers were why I quit using Linux.
With hope in my heart I got a Radeon, Eyefinity was the New Shiney and I was going to try it. Was a full 6+ months after retail availability in brick/mortar of the cards. Booted up my system....and no Xorg. No GUI at all. Duh. Oh, I must not have drivers....tried both the FOSS and proprietary drivers; wiped my XOrg config along the way. Was told my card was not compatible with the drivers. Did some digging....and AMD released those 6000-series Radeons without a driver of any kind for them on Linux. AMD had 6 months+ and there was no working driver to even get a basic XOrg GUI out of that card, I could understand a stripped-down basic driver---but nothing at all??!
Yea. I was ticked. IIRC I got that card out of NewEgg, who right around that time were falsifying RMA-claims against buyers LGA-socket motherboard buyers (they got a class-action lawsuit for doing that)...I didn't try fighting an RMA and set aside Linux for a long while.
Well Linux support for gpu drivers is a shame from both companies, AMD and Nvidia.
But AMD struggled even more with later GPU generation as it was a true disrupt vs GCN. Even on windows, AMD experiences major issues.
In near future we should see new GPU architecture with chiplet design and those should led again to drivers issues.
Regarding potential of big navi I'm referring to this table of frames per watt :
On Doom eternal :
RX 5700 XT : 3,161 frames/watt
RTX 3080 FE : 2,479 frames/watt
The only "IF" condition for big navi is this statement : RDNA 2 is 50% more efficient that RDNA 1...that could led big navi around 1,58 watt/frame...but there are so many factors that could destroy this efficiency.
Last time AMD was proud of its efficiceny they launched RX480...commercial success, but leaving Nvidia alone on higher end of the market