Linux 64-bit cannot use all of my 4GiB RAM.

Well, please forgive my nooby-ness but here is my problem:
Long ago I heard that 32-bit system cannot use 4GiB or more of RAM unless we turn on PAE option in kernel and 64-bit system can avoid this. So I installed 64-bit linux since I planned to upgrade my box to 4GiB Ram in the future. But somehow linux refuse to recognize all of my 4GiB Ram. I can only get 3.7GiB when run cat /proc/meminfo
[pntruongan@myhost ~]$ cat /proc/meminfo
MemTotal: 3720600 kB
MemFree: 2406720 kB
Buffers: 85732 kB
Cached: 588172 kB
SwapCached: 0 kB
Given that intergrated VGA took away roughly 256MiB of Ram then if I do the math right, I still have 3932160 kB left. Where is the rest?

See how BIOS report memory (e820 messages on dmesg)
Example in my system with 4GiB of RAM
BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000dfee0000 (usable)
BIOS-e820: 00000000dfee0000 - 00000000dfee3000 (ACPI NVS)
BIOS-e820: 00000000dfee3000 - 00000000dfef0000 (ACPI data)
BIOS-e820: 00000000dfef0000 - 00000000dff00000 (reserved)
BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000120000000 (usable) <- Remapped memory above 4GiB via AMD DRAM Controller DCT (internally called "memory hoisting")
Only "usable" areas are used as "memory"
Sometimes, these usables areas are set to reserved by kernel:
e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved) <- First 64KiB marked as reserved to avoid unwanted memory modifications surprise by BIOS.
e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
e820 update range: 00000000dff00000 - 0000000100000000 (usable) ==> (reserved)
Just sum these areas and you get available memory, and ahead you can see how from this memory, some ranges are used for kernel only.

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