I loved those cards. My daily driver was a fully stacked IIfx with a SuperMac card. I remember telling my friends my display was more than a thousand pixels (1152 or something) wide.
yup 1152x870 - essentially the largest number that is roughly a 4:3 aspect ratio and less than 1 megapixel (2^20 VRAM was so very expensive) (and meets a bunch of other limitations like video dot clocks, VRAM clock rates, must be a multiple of the width of the VRAM banks etc)
