question, 3.9 amd64, large memory needs

[jon butchar <butchar_(_dot_)_2_(_at_)_osu_(_dot_)_edu>]

Greetings.

I have a single-CPU Xeon-based system running FreeBSD's amd64, 
along with other computers running various OSs to use and look 
after.

Due to the quality of OpenBSD, I switched all my other computers 
to OpenBSD and <gasp> even ordered a CD set.

However, this Xeon system is used for heavy numbercrunching; R 
routinely gobbles up to 4.5 GB memory.  My question is whether 
OpenBSD will allow this memory allocation.  This is work-related 
stuff so I'm hesitant to try without some input.

Please forgive me if the answer is well-known.  I spent an hour 
Googling but didn't come up with much, especially for 3.9.

Thanks in advance,

jon