Portal with RTX has the most atrocious profile I have ever seen. It's performance is not (!) limited by it's RT performance at all, in fact it is not doing much raytracing per time bin on my 6900 XT. This is one GIGANTIC Ubershader that takes 99ms of frametime by itself. The hardware utilization is horrifically bad, and it's using the absolute maximum amount of VGPRs possible on RDNA2.

I have been annoyed with PC Gaming this week, so I think I should continue this thread. I have been annoyed by a visual bug with the RT Reflections in the @Steam release of @ControlRemedy for more than a year now and had basically given up hope:

https://twitter.com/JirayD/status/1595179989502201860

So when I started a new game last night on the EGS version, I was stunned when I got to the same spot and saw that the issue wasn't there (first screenshot.)
I eventually copied all RT shader object files from the EGS release to the Steam Version, and the issue was gone.(second)

Regarding the recent @digitalfoundry Scorn video. I believe the "FSR2 is particularly expensive and can take many milliseconds to compute" take is based on the testing in Deathloop earlier this year. Unfortunately those results were ignoring the native-resolution post-processing.

https://twitter.com/JirayD/status/1529209745483399168

Further benchmarks to prove this point will be coming soon, but here is a preview of FSR2 in Scorn.

1440p native and 4K FSR2 Quality (internally 1440p)
Compute Pass 7 is either TAA or FSR2, Color Pass 10 seems to be post-processsing.

So it's time for the followup to this thread.
First off, I am severely disappointed by anyone who chose Lithium. Lithium is a trace element on earth, which makes up less than a percent of a percent of earths crust. (0.004% in fact) 1/10
(p.20 of pubs.usgs.gov/pp/0127/report…)

https://twitter.com/JirayD/status/1556815534041309185

Secondly, this was a trick question, and the correct answer is either Aluminium, Iron, or Sodium, depending on your perspective.
Aluminium is the most abundant element on earth that can be used as a cation. Silicons chemical properties make it most likely unusable for this. 2/10

Let me explain what I think is the reason for the terrible RT performance of AMD cards in the gallery outside the NSC Control Room, the so called "Corridor of Doom." (@Dachsjaeger)
TL;DR: This scene is accidentally hitting every single worst case scenario at once.

https://twitter.com/JirayD/status/1553855048639303682

A word of warning: This is going to be complicated for anyone who is not familiar with the way Acceleration Structures are handled in DXR and Vulkan RT. I suggest reading up on the relationship between TLAS and BLAS. (Section 8)
developer.nvidia.com/rtx/raytracing…

So, my thoughts on my Steam Deck after two weeks (incl. 1 week of vacation.) This is going to be a "short" review thread. First: The good:
It's very comfortable to use.

The performance has been perfectly fine for nearly all games I played.

The screen is fine, even at minimum brightness. I have not noticed any ghosting. Also, the anti-glare etching really helped with outdoor usage.

I don't think people know how janky Linux Gaming was a few years ago and how much better it has gotten.
Up until Proton/SteamPlay was introduced, most Linux gamers had 2 or more Steam installation. One for your native games, one under Wine for the unproblematic games, and...1/6 another customized Wine based installation for each of the more problematic games. Lutris and PlayOnLinux were a godsend for managing these installations and quirks. Lutris is even capable of setting up a custom Wine/Proton installation for a lot of GoG or EGS games. 2/6