Actually my mistake, meant a BVison not Cybervision
Should be the same answer. IIRC, they both connect via the same interface to the accelerator card and have the same graphics chip and memory on board, unless there is less on the BlizzardVision than there is on the CyberVision. Both of my CyberVisions have 8mb of VRAM, but there might have been a 4mb VRAM version.