I have a new Dell 27" "gaming" monitor. I'm using the generic PNP drivers and everything works OK including the high 2560X1440 resolution. But I have to use HDMI2 or Display port on my PC (that I have) to get that resolution.
With VGA I doubt that you can get HD resolution.
Dell forum member since 2002
Dell Inspiron 15 - 5577 Laptop
Home Built Desktop PC with ASUS ROG Z170, i7 6700K CPU
Windows 10 64 bit Pro and Windows 10 Insider Program Beta Versions. SSD drives. Cakewalk by BandLab and Studio One 4.1 Recordng Studio Software.
Dell S2719dgf Monitor
Member of Nashville based R.O.P.E.