VESA 1.2 refers to the firmware of the card, or VESA BIOS Extensions Wikipedia. There are utilities to help extend these, such as UniVBE.
Finding powerful VLB cards can be both difficult and expensive. As The Serpent Rider has said, a DX4 class processor is on the higher end of 486 hardware. Any of the Cirrus Logic 5428, 5429, or 5434, an S3 Vision 864, 868, 964, or 968, or a Tseng Labs ET4000AX (at the minimum) or ET4000/W32 and variants would be better fits.
That being said, the 805 is quite compatible with DOS games, and will make do until you are able to acquire something on the more powerful/rare side.
MT-32 Old, CM-32L, CM-500, SC-55mkII, SC-88Pro, SC-D70, FB-01, MU2000EX
K6-III+/450/GA-5AX/G400 Max/Voodoo2 SLI/CT1750/MPU-401AT/Audigy 2ZS
486 Build