Quote from Bean0 :

the 320mb RAM becomes a limiting factor due to the size of the textures at higher resolutions.

if im not mistaken theres only one texture that will grow with resolution and thats the rendered image itself

Quote from Shotglass :

if im not mistaken theres only one texture that will grow with resolution and thats the rendered image itself

So it would be 'eye candy' settings then, shadows and whatnot ?

Quote from Bean0 :

So it would be 'eye candy' settings then, shadows and whatnot ?

note exactly sure tbh
but is suppose the most likely scenario is that the amount if pixel shader pipes you have becomes a limiting factor with a growing number of pixels to draw

LFS itself uses bugger all RAM, if i use all of my custom textures (which is a LOT!) at 1680*1050 LFS uses 125 MB vRAM at most.