Question Upgrade 27" 1440 to 32" 4k to play Arma, May Need To Use 1440?

[EricLane]

I ordered GIGABYTE M32U 32" 4K 144Hz Gaming Monitor with IPS, 1ms Response Time, HDMI 2.1, USB 3.0 - Black

This is an upgrade from my current 1440 27" 60Hz monitor.

I also just ordered a new GPU. I am hoping to play Arma Reforger and Arma 3 at 4k. But I am worried the new GPU cannot handle 4k and I'll be stuck on a 32" 4k monitor playing at 1440. Will this look worse than my current 27" 1440? Am I wasting $500?

My build (after my GPU arrives):
Case: Cooler Master HAF 932 Advanced ATX Full Tower
Motherboard (MOBO): MSI MAG Z490 TOMAHAWK LGA 1200 Intel Z490 SATA 6Gb/s ATX Intel Motherboard
CPU: Intel Core i7 10700K 3.8GHz 8-Core
Cooler: Cooler Master Hyper 212 EVO
GPU: XFX Speedster MERC310 Radeon RX 7900 XT (20GB GDDR6)
PSU: Corsair Professional 750W 80+ Gold Certified
Memory (RAM): G.SKILL Ripjaws V Series 32GB (2 x 16GB) DDR4 3600
HDD: Seagate Barracuda 1TB 3.5" 7200RPM
SSD: 2x Samsung 840 EVO 120GB 2.5"