4gb not showing up in Arch64

Hi all.
I finally installed Arch64 to take advantage of my 4gb of RAM and my Core 2 Duo. But I am having some problems. I don't think Arch sees all of it. It should not be a hardware problem because my BIOS correctly displays 4 gb. I left my 32-bit Arch on another partition and it actually sees more than Arch64.
Here is my meminfo under Arch64
$ cat /proc/meminfo
MemTotal: 2996504 kB
MemFree: 2856492 kB
Buffers: 7852 kB
Cached: 63932 kB
SwapCached: 0 kB
Active: 59900 kB
Inactive: 51180 kB
SwapTotal: 4249152 kB
SwapFree: 4249152 kB
Dirty: 220 kB
Writeback: 0 kB
AnonPages: 39476 kB
Mapped: 19176 kB
Slab: 11872 kB
SReclaimable: 6888 kB
SUnreclaim: 4984 kB
PageTables: 2792 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 5747404 kB
Committed_AS: 51408 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 2260 kB
VmallocChunk: 34359736099 kB
And here is my meminfo under 32-bit arch
$ cat /proc/meminfo
MemTotal: 3115920 kB
MemFree: 2951104 kB
Buffers: 7640 kB
Cached: 91980 kB
SwapCached: 0 kB
Active: 65716 kB
Inactive: 71328 kB
HighTotal: 2228032 kB
HighFree: 2086300 kB
LowTotal: 887888 kB
LowFree: 864804 kB
SwapTotal: 4249152 kB
SwapFree: 4249152 kB
Dirty: 228 kB
Writeback: 0 kB
AnonPages: 37276 kB
Mapped: 22288 kB
Slab: 8352 kB
SReclaimable: 4420 kB
SUnreclaim: 3932 kB
PageTables: 988 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 5807112 kB
Committed_AS: 88664 kB
VmallocTotal: 116728 kB
VmallocUsed: 45044 kB
VmallocChunk: 66036 kB
Just for kicks, I took out one stick and both Arch64 and 32-bit see the same 3 gb.
Any ideas?

Its an MSI P6N Platnium with an Nvidia 650i chipset.
I looked through the dmesg and I found one line that seems to indicate the problem.
WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 1024MB of RAM.
So I guess this means I have to update the BIOS, according to this thread.
http://www.hardforum.com/showthread.php?t=1164174
I have never had to update a BIOS before, but all the how-to's require either a floppy drive, or a Windows installation, of which I have neither.  I could install XP in a pinch and run the BIOS update utility but I really don't want to have to do that.

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