2gb to 6gb bios sees 6gb windows only sees 3.9gb

We have 6 slots (3 banks), 2 bank ares pc2100 ECC ram with 512mb each. We just installed in the last  banks 2 sticks of pc2700 2gb sticks for a total of 6gigs of ram, the board supports up to 12gigs of ram, I am stumped why bios can see all six gigs but windows only sees 3.9gigs.

Intel server board: SE7501HG2
Windows: Small business Server 2003
All Ram is ECC and certifed to work with the board according to intel
Who is Participating?
Scott CConnect With a Mentor Senior Systems EnginerCommented:
Here is your answer...


Windows Small Business Sever 2003 both Standard and Premium have a limit of 4 gig.

CallandorConnect With a Mentor Commented:
This question gets asked time and time again - 32-bit Windows only sees 4GB max, due to the number of addresses that 32 bits is capable of pointing to.  See http://www.experts-exchange.com/Hardware/Q_21733435.html
compukenAuthor Commented:
thanks Now I see why doesn't see all but why does it only see 3.9gig and not 4gb?
Did you read my link to the other question?  There are BIOSes, device interrupts and other hardware addresses that use up some of the available address space.  On a system with 2GB, these would be invisible to the user.
compukenAuthor Commented:
perfect thanks
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