HiDpi 1080p on UHD 630 and Dell U2515H

Hello,

I'm writing here because I tried every fix I found online but still coudn't do it.

I have an 8600k (UHD 630), smbios 19.2 on a vanilla mojave install 10.14.6 and the U2515H Dell monitor (2560x1440).

On my macbook pro 15, with switchresx scaled resolution, I'm able to select 1080 hidpi with this monitor. On the hackintosh I can do 1440x810 or lower hidpi but not 1080 (I can choose 3000x2000 hidpi so it's not an "upper limit" of the gpu). Any help? Thanks