12GB installed and 10GB useable. Help

I followed the post by farbs and jaquith about setting up the bios for 6 strips of ram. I have G-Skill 6 bars 2GB each. I changed Extreme Memory Profile -> Disabled. Then System Memory Multiplier-> 12. Then DRAM Timing Selectable-> Quick. CAS Latency Time ->9. Then tRCD->9 Then tRP->9 Then tRAS->24. Then Command Rate(CMD)->2 Then QPI/Vtt Voltage-> 1.375v. Then DRAM Voltage ->1.680v. I started with the lower voltages and no change at first. As I went up to higher voltages until more ram started to show. First it said 12gb installed and 8gb usable, Then it went to 12gb installed to 10gb usable. Then it went to 12gb installed and 12gb usable. Then it went back off as I restarted my computer. So I turned it up to the next voltage until it said 12 installed and 12gb usable and stayed that way after restarts. I change the QPI/Vtt Voltage to 1.375v and the DRAM Voltage to 1.680v and it is showing 12gb installed and 12gb usable. Will these voltages harm the system ? My temp says 50 Celsius. I have restarted a few times and also checked the bios and it is staying stable at 12Gb installed and 12Gb usable. But when I shut down my computer completely and when it started back up it went back to 12GB installed and 10GB useable. I'm not sure where to go from here, Thank You for your help. OS Name Microsoft Windows 7 Professional Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name FAMILYCOMPUTER
System Manufacturer Gigabyte Technology Co., Ltd.
System Model X58A-UD3R
System Type x64-based PC
Processor Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2661 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. F2, 1/29/2010
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name familycomputer\Larry and Cindy
Time Zone Eastern Daylight Time
Installed Physical Memory (RAM) 12.0 GB
Total Physical Memory 12.0 GB
Available Physical Memory 9.55 GB
Total Virtual Memory 12.2 GB
Available Virtual Memory 9.61 GB
Page File Space 200 MB
Page File C:\pagefile.sys
Right now it shows 12Gb of ram, but when I do a shutdown it comes back as 12GB installed and 10GB usable. Is this what you need. Thanks
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