The Video Electronics Standards Association (VESA) designed the VLB standard to extend the ISA bus with an additional connector for higher memory bandwidth for more advanced graphics cards. The ISA bus standard on computers of the time had insufficient bandwidth for graphics cards, which were becoming increasingly popular with the rise of graphical user interfaces. The VLB interface was created in 1992 and was often included on motherboards designed for the Intel 486 processor. It offered memory bandwidth of up to 200 MB/s when used with a 50 MHz 486 processor, compared to a maximum of 16 MB/s over the ISA bus.
A VLB expansion slot consists of an ISA slot paired with an additional slot in line behind it. A VLB interface adds an expansion slot for a video card to accelerate graphics processing. VLB, also abbreviated as VL-bus, is an expansion bus on some computer motherboards.
