Shared Graphics Memory
In computer structure, shared graphics memory refers to a design where the graphics chip doesn't have its personal devoted memory, and instead shares the primary system RAM with the CPU and other elements. This design is used with many built-in graphics solutions to reduce the price and complexity of the motherboard design, as no additional memory chips are required on the board. There may be usually some mechanism (via the BIOS or a jumper setting) to pick the quantity of system memory to make use of for graphics, which means that the graphics system could be tailored to only use as a lot RAM as is definitely required, leaving the remainder free for functions. A facet effect of that is that when some RAM is allocated for graphics, it becomes successfully unavailable for anything, so an instance pc with 512 MiB RAM set up with sixty four MiB graphics RAM will appear to the working system and user to only have 448 MiB RAM installed.
The disadvantage of this design is lower efficiency as a result of system RAM usually runs slower than devoted graphics RAM, and there may be more contention as the memory bus must be shared with the rest of the system. It might also trigger performance issues with the rest of the system if it's not designed with the fact in thoughts that some RAM will probably be 'taken away' by graphics. The memory in these machines is simply one fast pool (2.1 GB per second in 1996) shared between system and graphics. Sharing is carried out on demand, together with pointer redirection communication between predominant system and graphics subsystem. This is named Unified Memory Architecture (UMA). Most early private computers used a shared Memory Wave Experience design with graphics hardware sharing memory with the CPU. Such designs saved cash as a single financial institution of DRAM may very well be used for both display and program. Examples of this embody the Apple II laptop, the Commodore 64, the Radio Shack Shade Laptop, the Atari ST, and the Apple Macintosh. A notable exception was the IBM Laptop. Graphics display was facilitated by way of an enlargement card with its personal memory plugged into an ISA slot. The primary IBM Computer to make use of the SMA was the IBM PCjr, released in 1984. Video memory was shared with the primary 128 KiB of RAM. The exact dimension of the video memory could be reconfigured by software to satisfy the needs of the present program. An early hybrid system was the Commodore Amiga which may run as a shared memory system, but would load executable code preferentially into non-shared "fast RAM" if it was obtainable. Later, the DirectX 6.1 introduced software assist for shared graphics memory. Hardware to further assist shared graphics memory embrace Intel DVMT and NVIDIA TurboCache.
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