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Multibank DRAM (MDRAM)
A new type of memory that attempts to address two problems with conventional video memory, Multibank DRAM or MDRAM was invented by MoSys specifically for use in graphics cards. MDRAM differs substantially in design from other types of video memory. Conventional memory designs use a single monolithic "block" of memory for the frame buffer. MDRAM breaks its memory up into multiple 32 KB banks that can be accessed independently. This provides the following advantages:
MDRAM is also cost-effective to manufacture compared to VRAM and is efficiently organized to reduce waste. MDRAM is suitable for use in high-end applications and is becoming popular due to its performance-enhancing and cost-reducing features. Its most popular implementation is probably on the Tseng Labs ET6000 chipset, currently being used by several card manufacturers.