8.00 GB of installed RAM/MEMORY but only 3.99 GB "usable"

Here is my system:
OS: Windows 7 Home Premium 64-Bit
CPU: Intel i5 750 @ 2.67Ghz
Motherboard: MSI P55 GD65
Ram: G.Skill 4x 2gb 240-Pin DDR3 1333 (PC3 10666) dual channel memory (8gb total)
BIOS shows 8gb of installed RAM, Task Manager shows 8gb installed RAM, Resource Manager shows 8gb installed RAM. Right-clicking My Computer > Properties shows "Installed Memory (RAM): 8.00 GB (3.99 GB usable)" 
With all the research and other forums posts I found, I have:
- Tested all 4 ram sticks individually (before the G.Skill I had the same problem with 2 Kingston sticks)
- Unchecked maximum memory in msconfig.exe > BOOT > ADVANCED
- Updated BIOS to latest version (1.11 a.k.a 1.B0)
- Loaded BIOS optimized defaults
- Cleared CMOS and loaded optimized defaults again
- Tested memory with Windows Memory Diagnostics tool with no errors
- Removed CPU to check socket for bent pins...no bent pins...reseated CPU
I have not:
Enabled "Memory Remapping" in BIOS because I do not have that option available in BIOS
I did read this post about G.Skill ram: https://forum-en.msi.com/index.php?topic=178019.0 and checked by ram settings and they are automatically already at the 9-9-9-24 timings, 1T command rate.
Yikes! What else is a man to do?

Quote from: RemusM on 17-March-14, 15:34:37
OK.
Perform the following tests with 2 memory modules (4GB RAM):
1)
1.a) use the slots 1 & 2 (those close to the CPU).
Check out the usable system memory
1.b) use the slots 1 & 3
Check out the usable system memory
2) msconfig.exe / Boot / Advanced
2.a) set the max memory to 4096MB and reboot
Check out the usable system memory
2.b) unset (uncheck) the max memory setting and reboot.
Check out the usable system memory
3) use the same 2 memory modules (4GB), access the BIOS and make them run at 1066MHz (7-7-7-20 at 1.50...1.55V)
If all the above don't fix the issue, post a screenshot of the memory mapping (System Information / Hardware Resources / Memory)
Good luck.
Alright, RemusM...got some new developments here. Thanks for sticking with me....
1)
1.a) Slots 1 & 2 (single channel mode): 4gb installed, 4 gb read and usable by OS
1.b) Slots 1 & 3 (dual channel mode): 4 gb installed, 4gb read but only 1.99 usable by OS
I stopped there and did some more slot tests...and I stand corrected from my earlier comments (I had written down that each stick worked in each slot, individually, but these notes are from 5 years ago...so...however):
With only 1 stick installed (2gb), starting closest to CPU:
- Slot 2 (blue plastic slot): PC will not start, motherboard beeps 3 long beeps (ram error, from what I Googled)
- Slot 1 (black plastic slot): PC starts, 2gb read and usable by BIOS and OS
- Slot 4 (blue plastic slot): PC will not start, motherboard beeps 3 long beeps (ram error, from what I Googled)
- Slot 3 (black plastic slot): PC attempts to start (3 times, fans and lights start and then stop) and then it hangs (with fans and lights on but does not start)
Would I be right to assume my Slot 3 has been the problem all along? Or is the motherboard supposed to only start with 1 stick of ram in slot #1?
Also of note: since I first built this computer it has always took 3 attempted starts (fans and lights go and stop) to finally fire up (I know, I should have realized this red flag sooner and probably mentioned it).
Also of note: with 3 sticks installed - in slot 2,1,3 - the system reads all 6gb but only 3.99 usable by the OS again. Indicating, I would think, that only slot 2 and 1 are being used.

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