I know, nobody asked for this, which is why I'm posting. Don't worry it will all make sense soooooon.....
Dell Optiplex 9020 MT
16GB Dell DDR3-1600 CL11 (4x4GB)
Core i5-4590
Radeon RX 6400, @PCIe 3.0 of course
General notes on the 6400: I played a little more through SotTR where I'm at and it plays fine at a decent mix of Lo thru Hi settings for visual quality @1080p, averaging 45-50fps. Many games play very well on this system but the *CPU* is a bottleneck in AC: Odyssey, just pegged at 90% or higher all the time at around 45fps. Game plays the same at 1080p as 1440p as the GPU is twiddling its thumbs at 1080p. CP2077 plays OK with a mix of lo and med at 48FPS w/FSR2.0 @1080p but the new FSR2.0 hack makes specular highlights inside look *horrible* so even though I get a 20% increase in FPS, I prefer the 40fps native. Other things look quite good with FSR 2.0, including my annoyance: the jittery palm fronds. HZD is very playable at 900p 45-55 FPS, and I covered a lot of the game this way, however this card suffers from a Radeon driver error I see on occasion: flickering in-game assets, like trees and rocks. They'll flicker out and back in in a split second, seems to happen at night and only at some times. Immersion-breaking though. Forza Horizon 4 plays at around 120FPS @1440p with mostly High settings with some Ultra (car detail) and 4xMSAA (IMO an absolute requirement, I hate jaggies!). Speaking of jaggies, Rocket League plays at 120-144 FPS @1440p but gives the impression that its CPU-limited as there are infrequent but annoying frame drops correlated with high CPU use. I'm gonna swap in another CPU if I can or swap the 6400 out to another chassis to confirm. Doom (2016) plays 1440p @~95FPS at High settings and is smooth as silk. Tomb Raider (2013) crashes out as soon as the rendered menu screen loads, I've never seen this behavior, might have to reinstall as I even play this game on Intel iGPUs and an old 1GB Radeon 8570 DDR2. Indie games like Slime Rancher and Raft play great at 60-90FPS 1440p High settings, as you'd expect. Low poly games like these look and play exactly the same to me at 60, 90, and 120FPS, I can't detect the difference. But Rocket League at 60, 90, 144 FPS, those differences are obvious.