Shared Graphics Memory

In laptop structure, shared graphics memory refers to a design where the graphics chip doesn't have its own devoted memory, and instead shares the main system RAM with the CPU and other parts. This design is used with many built-in graphics options to cut back the associated fee and complexity of the motherboard design, as no additional memory chips are required on the board. There is usually some mechanism (via the BIOS or a jumper setting) to pick the amount of system Memory Wave Workshop to make use of for graphics, which implies that the graphics system may be tailor-made to only use as a lot RAM as is actually required, leaving the remainder free for purposes. A side effect of this is that when some RAM is allocated for graphics, it becomes successfully unavailable for anything else, so an instance laptop with 512 MiB RAM set up with sixty four MiB graphics RAM will appear to the operating system and consumer to only have 448 MiB RAM put in.

The disadvantage of this design is decrease performance because system RAM normally runs slower than dedicated graphics RAM, and there may be extra contention because the memory bus must be shared with the remainder of the system. It may also trigger performance issues with the rest of the system if it is not designed with the actual fact in thoughts that some RAM will 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, including pointer redirection communication between most important system and Memory Wave Workshop graphics subsystem. This is named Unified Memory Structure (UMA). Most early private computers used a shared memory design with graphics hardware sharing memory with the CPU. Such designs saved cash as a single bank of DRAM could possibly be used for both display and program. Examples of this include the Apple II laptop, the Commodore 64, the Radio Shack Color Laptop, the Atari ST, and the Apple Macintosh. A notable exception was the IBM Pc. Graphics display was facilitated by way of an expansion card with its own memory plugged into an ISA slot. The first IBM Computer to use the SMA was the IBM PCjr, launched in 1984. Video memory was shared with the first 128 KiB of RAM. The exact dimension of the video memory might be reconfigured by software program to meet the wants of the present program. An early hybrid system was the Commodore Amiga which could run as a shared memory system, but would load executable code preferentially into non-shared "fast RAM" if it was accessible. Later, the DirectX 6.1 introduced software program assist for shared graphics memory. Hardware to further support shared graphics memory embody Intel DVMT and NVIDIA TurboCache.

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