32-Bit Programs on 64-Bit OS

Mobius1 | 18:48 Wed 03rd Aug 2011 | Technology

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When running a 32-Bit application on a 64-Bit OS is the application still limited in the amount of memory it is able to address? E.g is a 32-Bit game able to make use of or benefit from more than 4GB of RAM if the system has, say, 8 gigs?

Games are just an example. The question relates to any program really.

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rojash

No, because 32 bit programs are built with 32 bit compilers, and are therefore limited to using integers with a maximum of 32 bits. The largest number you can store in 32 bits is 4,294,967,295. Consequently there is no way of pointing to an memory address beyond the 4 MB limit.

rojash

"4 MB limit." !!!
4 GB limit :-)

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