32 or 64??

Odd iodine at runbox.no
Sat Jan 30 20:22:30 UTC 2010


Clemens Eisserer wrote:
>> I'll be installing on an HP G71-340US with 4GB RAM.  It came with
>> 64-bit Windows 7 installed.
> 
> So running a 32-bit OS, you won't be able to use all those 4GB, but a
> bit less (say 3,5GB).
> But again, keep in mind applications running in 64-bit mode uses more
> memory, so you won't gain a lot here.

It doesn't use much more memory. In some cases 64 bit code uses less
memory than 32 bit code, due to the added 8 general purpose registers.
Those give more flexibility in making optimized code, which would not
have been possible on x86.

-- 
Odd




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