ASUS ROG Strix 32” 4K OLED Gaming Monitor (XG32UCWMG) - TrueBlack Glossy, Dual Mode(4K@240Hz, FHD@480Hz), 0.03ms, G-SYNC Compatible, Neo Proximity Sensor, USB-C, HDMI 2.1, 3 yr Warranty

9070xt can run high fps for 4k at minecraft and the games he will likely play I owned a high hz 1440p monitor and a 4k oled yes there is a huge difference 240hz is high refresh already Thr price difference is only like 300$ with the sales going on right now He doesnt need to max the refresh of the monitor https://www.amazon.com/ASUS-XG32UCWMG-Early-Set-up/dp/B0F732KMQQ monitors like these have dual settings Look at benchmarks

Don't know about the cheapest 4K OLEDs, but in terms of high end 32" 4K OLEDs, I like the Asus TrueBlack glossy WOLED for $830. Also, there's the Samsung 4th Gen QD-OLED for $1000. This is the (matte version of the) new 2026 QD-OLED generation used in the PG32UDCM3 which some QD-OLED enthusiasts call the best panel out now. Though if you're more budget conscious you should stick to previous gen.

I personally love the ASUS ROG Swift in 4k 244 HZ(480hz in FHD) but it's mad expensive. Best looking and performing monitor I've ever used though. https://a.co/d/071TVf8B