About 256 gigs RAM is currently the most a MAC and Windows PC will handle. You would not need any more than this.
"You would not need any more than this." - computer salesmen have been saying that since the first day i walked into a computer store when i was a kid in the early eighties, come on man! If you are trying to push the limits of development you will always need more.
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Most memory cards are 1 GB max, but all computers have at least 2 slots and sometimes 4 (total0 for extra chips. Very few can use more than 3 GB and about 2 is optimum for Vista. More than 3 and it is likely to got to waste anyway.