20x is a huge exaggeration. It’s more like 5x in hypothetical flops.
For example, in Elden Ring an optimized 800p with mixed low to medium settings will hit 45 FPS.
On a 5700XT you’re looking at the high 90fps range for 1080p medium settings.
So it’s really in all practical purposes 2-3 times better and your steam deck has a maximum refresh rate of 90Hz anyway. On a screen that size you’ll barely see the difference between medium and ultra settings.
Something notable is that because of how math maths, 45FPS is a LOT better looking than 30FPS.
Finally, I’ll point out that anyone with hardware this old still has the option of using normal sunshine. Or you can just get a 6000 series card, the difference in cost between a 6600XT and a 5700XT is less than $50.
Running Kingdom Come Deliverance 2 on the deck gets around 30-45 fps with some lag spikes on low settings. Streaming from my 5700xt I can get 90fps ultra. It's massively better to stream from even this old GPU than to play locally.
For example, in Elden Ring an optimized 800p with mixed low to medium settings will hit 45 FPS.
On a 5700XT you’re looking at the high 90fps range for 1080p medium settings.
So it’s really in all practical purposes 2-3 times better and your steam deck has a maximum refresh rate of 90Hz anyway. On a screen that size you’ll barely see the difference between medium and ultra settings.
Something notable is that because of how math maths, 45FPS is a LOT better looking than 30FPS.
Finally, I’ll point out that anyone with hardware this old still has the option of using normal sunshine. Or you can just get a 6000 series card, the difference in cost between a 6600XT and a 5700XT is less than $50.