I\'ve got 1.5GB on my Giga machine. Some run 2GB and get slightly more samples loaded. Nothing above that seems to help.
If I\'ve got the theory straight, 2.5GB would be the ideal amount for GS3: the full 2GB for Giga and 512M for the OS. But that\'s only if GS3 is able to squeeze those last few bytes away from Windows. If GS3 doesn\'t improve RAM usage, then 2.0GB is as good as much as you can make use of.
Depends on what OS you\'re running and what else you run with giga. Been seeing posts saying giga won\'t use more than 1.5gb itself with WinXP. It\'s not clear if they\'re talking sample caching or giga\'s program interface and other stuff, however. But if you run a sequencer with it, that would probably make use of more ram or at least not take any away from giga.
Giga 3 will only use 2 GB of memory with the OS. Kernel mode only has 2 GB of memory available. This is a limitation of Windows. Since Giga 3 has to share this space with the OS, 1.5 GB is what\'s left. So it won\'t help to have more than 2 GB in the machine for Giga.
i personally would prefer to get a board with a 875 chipset - this would offer additional support to raid (even combined serial and parallel ATA disks), which speeds up file access for GS significantly - at least that\'s what i\'ve noticed
ps: for details see this page