(06-08-2009, 09:32 AM)Variable link Wrote: 64bit OS- Which one of the available OS is of that kind?
There are such versions of more or less recent OS'es
XP 64 bit
Vista 64 bit
Win 7 64 bit
I wouldn't advice you to go for Vista though. Pick Win7 64 bit when you will have more RAM while it is still free for testing, other 64-bit OS'es suitable for ArmA2 don't have "demo versions".
Also when you will order a CPU make sure you'll order a good cooling system because there is no point not to overclock new processors as they are really fit for it - in case you will need additional power.