Shared Graphics Memory
In pc architecture, shared graphics memory refers to a design where the graphics chip doesn't have its personal dedicated memory, and as an alternative shares the main system RAM with the CPU and different components. This design is used with many built-in graphics options to scale back the cost and complexity of the motherboard design, as no further memory chips are required on the board. There is normally some mechanism (via the BIOS or a jumper setting) to pick the quantity of system memory to make use of for graphics, which implies that the graphics system could be tailor-made to only use as much RAM as is definitely required, leaving the remaining free for MemoryWave Guide applications. A side impact of that is that when some RAM is allocated for graphics, it becomes effectively unavailable for anything, so an instance pc with 512 MiB RAM set up with sixty four MiB graphics RAM will appear to the operating system and MemoryWave Guide user to solely have 448 MiB RAM installed.
The disadvantage of this design is lower performance because system RAM normally runs slower than devoted graphics RAM, and there's more contention because the memory bus must be shared with the rest of the system. It may also trigger performance points with the remainder of the system if it's not designed with the very fact in mind that some RAM can be 'taken away' by graphics. The memory in these machines is solely one quick 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 called Unified Memory Architecture (UMA). Most early personal computers used a shared memory design with graphics hardware sharing memory with the CPU. Such designs saved cash as a single bank of DRAM may very well be used for both display and program. Examples of this embrace the Apple II computer, the Commodore 64, the Radio Shack Coloration Pc, the Atari ST, and the Apple Macintosh. A notable exception was the IBM Laptop. Graphics show was facilitated by way of an enlargement card with its personal memory plugged into an ISA slot. The primary IBM Computer to use the SMA was the IBM PCjr, launched in 1984. Video memory was shared with the primary 128 KiB of RAM. The exact size of the video memory might be reconfigured by software program to meet the needs of the current program. An early hybrid system was the Commodore Amiga which may run as a shared memory system, however would load executable code preferentially into non-shared "quick RAM" if it was obtainable. Later, the DirectX 6.1 introduced software program support for shared graphics memory. Hardware to additional help shared graphics memory include Intel DVMT and NVIDIA TurboCache.
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