RAM not recognized

[Cesar Amaya]

Hello every one, I have installed FreeBSD-7.0_RELEASE on Dell Power Edge 
1950 Quad Core and 4GB of RAM.

The problem is that FreeBSD does not recognize all of the RAM.
This is part of the dmesg.
# dmesg
CPU: Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz (2496.28-MHz 
686-class CPU)
  Origin = "GenuineIntel"  Id = 0x10676  Stepping = 6
  
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  
Features2=0xce3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,<b19>>
  AMD Features=0x20100000<NX,LM>
  AMD Features2=0x1<LAHF>
  Cores per package: 4
real memory  = 3484745728 (3323 MB)
avail memory = 3405631488 (3247 MB)
ACPI APIC Table: <DELL   PE_SC3  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
ioapic0: Changing APIC ID to 4
ioapic0 <Version 2.0> irqs 0-23 on motherboard

Can anyone give me some light in this issue?
Thank you very much!!!