Synchronous Graphics RAM (SGRAM) is a clock-synchronized DRAM that is a relatively low-cost video memory.Rambus DRAM is a VRAM designed by Rambus that includes a proprietary bus that speeds up the data flow between VRAM and the frame buffer.MDRAM is also cheaper since, unlike other forms of VRAM, cards can be manufactured with just the right amount of RAM for a given resolution capability, instead of requiring it to be in multiples of megabytes. Having individual memory banks enables access to be performed concurrently, increasing overall performance. Traditional VRAM is monolithic, where the entire frame buffer is accessed at one time. It divides memory into multiple 32 kilobyte (KB) parts, or banks, that can be accessed individually. Multibank DRAM (MDRAM) is a high-performance RAM developed by MoSys.The dual-port design was the main difference between system RAM and VRAM in the 1980s and into the 1990s. Previous high-performance forms of VRAM were dual-ported, which means that while the processor is writing a new image to VRAM, the display is reading from VRAM to refresh its current display content. If the display is an older cathode ray tube model, or if the modern display is connected by an older VGA (video graphics array) connector to the video card, the video signal is first converted by a RAM digital-to-analog converter into analog signals that are sent to the display. When images are to be sent to the display, they are first read by the processor as data from some form of main (non-video) RAM and then written to VRAM.įrom VRAM, the data is sent as a digital signal via a digital video interface or high-definition multimedia interface, or HDMI, video port to a modern, flat-screen LED (light-emitting diode) display. VRAM is a buffer between the computer processor and the display and is often called the frame buffer. People commonly use VRAM for applications such as video games or 3D graphic design programs.Īll types of VRAM are special arrangements of dynamic RAM ( DRAM). It is most important in applications that display complex image textures or render polygon-based three-dimensional (3D) structures. VRAM's purpose is to ensure the even and smooth execution of graphics display. VRAM (video RAM) refers to any type of random access memory (RAM) specifically used to store image data for a computer display.
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