MBP with 4GB on board, Leopard use only 3GB

I've a MBP with 4GB. The ram has been upgraded from 2GB to 4GB more than one year ago without problem. At that time the system recognized ad used all 4GB of ram.
Today I've found out that Leopard doesn't use more than 3GB. System Activity Monitor show me (as any other place where I can look for information about ram) that the system have 4GB of ram, but it uses only 3.
I've already tried these possibile solutions, but the problem is still there.
http://support.apple.com/kb/HT1411
http://support.apple.com/kb/HT1379
This are System Profiler info on my ram
BANK 0/DIMM0:
Dimensioni: 2 GB
Tipo: DDR2 SDRAM
Velocità: 667 MHz
Stato: OK
Produttore: 0x7F98000000000000
Codice prodotto: 0x393930353239352D3035352E4130304C4600
Numero di serie: 0x0C164630
BANK 1/DIMM1:
Dimensioni: 2 GB
Tipo: DDR2 SDRAM
Velocità: 667 MHz
Stato: OK
Produttore: 0x7F98000000000000
Codice prodotto: 0x393930353239352D3035352E4130304C4600
Numero di serie: 0x0B164230
Any help is appreciated.
Thanks

kimu wrote:
The processor speed is 2.33 Ghz but I'm sure that when I upgraded all 4 GB was used.
Well, sure or not, you are incorrect. Your machine cannot (and has never been able to) use the entire 4 GB, it's a limitation of the memory controller. Despite that limitation, it does show up in System Profiler and in About this Mac as 4 GB. However, only the 2.2/2.4/2.6 GHz MBPs can use the entire 4 GB - yours cannot.
In these last days I've had an heavy reduction of speed. I've noticed it because I use a lot of virtual machines and now it's almost impossibile to load more than one.
How much free space do you have on your hard disk? More than 15% of it's capacity?

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