Is FreeBSD displaying my RAM correctly?

[Robert G.]

I have a couple of years old Gateway computer I installed FreeBSD on. 
It came with a P4 2.26GHz CPU (which it recognizes correctly), but when 
I check out /var/boot/dmesg.today I see the following:

real memory  = 536608768 (511 MB)
avail memory = 519630848 (495 MB)

Does this mean it's only recognizing about 512MB of RAM, or am I 
interpreting it wrong?

-- 
Robert G.