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markers said:

is 4gb enough? why not have say....6gb? of ram that is

 

4gb is more than enough. you ened vista 64 to use all of that 4gb, and nearly no single application can use more than 2gb ram.

as long as 32bit os stay the standard 4gb will be enough (which is most likely true for next generation of windows too).

edit: wanted to add that a 32bit operating system can address a maximum of 4gb ram, and in this address space it also has to insert the gfx card ram, bios and some otehr things so with 4gb ram on a 32bit os you end up with only 3-3.5gb useable ram. also 32 bit windows does not allow standard applications to access more than 2gb ram, you need teh applications to be flagged specifically to be allowed to do that and  tehy need to use special adressing modes. so nerly no application or game that is made for 32 bit windows can access more than 2gb.

under 64 bit operating systems these limitations are lifted since you can access 16 EiB (Exbibyte 1 EiB= 260 Byte = 1.152.921.504.606.846.976 Byte ) which is much more than we can think of atm.