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GART is used as a means of data transfer between the main memory and video memory, but can also be used to expand the amount of video memory available for graphics cards — particularly for cards with no dedicated video memory, such as Intel's integrated graphics solutions.
For example, 3D objects rendered in dots are somewhat tricky on systems without byte-per-pixel displays or limited video memory bandwidth, or systems with slow and/or limited (e.g. 8 bit, no FPU) CPUs.
Compared to the unified system and video memory used by other 8-bit computers of the time, such as the Apple II, ZX Spectrum, and Commodore 64, separate memory has the advantage of freeing up of the Z80 processor's 64 KiB address space for main RAM, and the VDP doesn't need to steal CPU cycles to access video memory.
This figure could lie between 16-128MiB, with NVIDIA listing only total memory from both video memory and main memory.
3.5 GB free, 64 MB of video memory recommended
Linux 2.2+ or Windows 98-Win7, 733 MHz x86 CPU, 128 MB RAM, video card with 16 MB RAM, 3 GB HDD space, DirectX 8.1 or OpenGL 1.2
Mac OS X 10.2.6+, 700 MHz PowerPC G4 CPU, 256 MB RAM, GeForce 2 MX or Radeon with 32 MB RAM, 3 GB HDD space