Windows 7 64 bit 6 GB of Ram but only 3GBs of ram can be used

6 GB of ram, I installed and I checked and I saw only about 3 GB of usable ram. I have Windows 7 64 bit installed, why do I only get all the 6 GB of ram?

Laptop Toshiba Satellite C655 S5212
Intel Core i3 - 2310 M 2.10 GHz processor

6 GB of ram, I installed and I checked and I saw only about 3 GB of usable ram. I have Windows 7 64 bit installed, why do I only get all the 6 GB of ram?

Laptop Toshiba Satellite C655 S5212
Intel Core i3 - 2310 M 2.10 GHz processor

What does show in your BIOS?

Read this - #4.  # 4, take note of the NOTE and you want to enjoy all of your available memory in this case.

EDIT:
Sorry - my link did not through...
http://www.SevenForums.com/tutorials/66482-memory-set-maximum-amount-used-Windows-7-a.html

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