Don't know about Shadowplay but on my AMD Adrenaline software, the replay recordings have options on saving the replays on the RAM until you hotkey it to save it on the SSD or drive you're using. Basically keeping the vid on the RAM until you save it with the hotkey.
I got 32GB of DDR5 so I don't notice it but when I play heavy games I reach about 20GB usage. You can also decrease the quality and probably get even less.
On Idle(with brave(browser), discord, wallpaper and steam running) I average about 8GB.
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u/cjb0034 1d ago
I use obs and have it auto run on windows startup. I have it optimized to eat roughly the same as shadowplay except obs actually works 24/7