RTX 4090 ad DLSS 3 am I missing something?

For sure it is, with DLSS you are only increasing the disparity between gpu and cpu … this is not helped that you are only running in 2k … either bump renderscale or create and test a custom 4k resolution in NVCP and edit the new size to UserCfg.opt. you can but you don’t need to use this for your normal desktop resolution.