cool, i'm getting 4 anyway...![]()
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4 would be the optimal and a bit overkill but if you have the cash and the right hardware to run it and if you use the system for video editing, 4 will come in handy.
Make sure the motherboard will indeed support 4 gigs of memory @ full speed.
Older motherboards may downgrade the memory timing and speed if more than 2 sticks are in the system regardless of the OS.
Also, some motherboards require certain types of memory be installed to enable full speed operation.. consult the manual to be sure of what you are doing prior to any purchase.
WindowsXP will not recognize more than around 3.2gig and that requires a special switch be applied to the boot.ini file, otherwise it may not see more than 2.8-3gig. Vista and XP x64 will recognize and use everything you can throw at it with general public hardware.