FreeBSD 5.4 and 4GB of RAM

OK. We're setting up some new web servers with FreeBSD 5.4-STABLE. They've all got 4GB of RAM installed in them, and PAE has been enabled. However, the two machines are reporting different amounts of available memory.

Machine 1: Dell PE2650, 4GB RAM, Dual 3.6Ghz Xeons.

Code: 
real memory  = 5100273664 (4864 MB)
avail memory = 4187783168 (3993 MB)
Machine 2: Dell PE2650, 4GB RAM, Dual 2.0Ghz Xeons.

Code: 
real memory  = 3959291904 (3775 MB)
avail memory = 3873579008 (3694 MB)
Notice that machine 2, has a much smaller amount of RAM available.

Anybody ran into this problem before?

 

 

 

 

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