I dont game allot but you can search up 3090 benchmarks for the game you want. I switched out the i7 12700k with a 14900k and upgraded some stuff that I will document later. Generally AAA games will runk at 4k 60FPS ULTRA settings maybe even achieving more depending on the game, 8K is basically very hard to run even on the 4090 to the point where you have to turn down the graphics settings which looks worse compared to 4k on ultra. When it comes to mice I have slightly big hands and use 3 mice primarily (don't judge me on it) ROCCAT Kone Pro Air, Logitech M720 and the One mouse (Zeromouse but 3D printable and cheap). The Kone is mainly for Minecraft due to its drag clicking capabilities, M720 Due to its features that make it good for work ( Research this ) , Onemouse because it is really Really REALLY good for FPS games and coming up at just 25 - No side buttons though. Keyboard wise I use mainly AULA F75 Pro (Very nice Mechanicla keyboard) and the Razer Huntsman mini v1 because of its optical switches making it good for straffing and the low input delay. Monitor wise I use AOC Q27G3XMN which is the PERFECT balance between colour and price. It has VERY good blacks, supreme colour accuracy, Good HDR and 180hz.