Question Have I maxed out RAM on this old machine or is there a way to make all of it accessible?

[sdhaku]

I built this machine back in 2009 and have made as many mods over the years to keep it hanging on, honestly maxing out everywhere area I could. It's still a great machine. One of the pain points has been the RAM so recently I upgraded to 6 sticks of Samsung M378B1G73QH0-CK0 8GB DDR3 1600Mhz Desktop Memory RAM. This is listed as compatible with the MOBO. When I go into the Resource Monitor I do see 49152 MB of installed memory. However, it only says 11005 MB is available. I understand this machine is old from software and hardware standpoint but is there anything I can do to make all this RAM available? Perhaps go into the BIOS and change some settings or something?

OS: Win7 Pro
CPU: Intel Core i7-920 Bloomfield 2.66GHz LGA 1366 130W Quad-Core Processor
MOTHERBOARD: GIGABYTE GA-EX58-UD5 LGA 1366 Intel X58 ATX Intel Motherboard

 

[punkncat]

Take a look here:

https://www.gigabyte.com/Motherboard/GA-EX58-UD5-rev-10/sp#sp

It appears the board may not properly allocate 8GB sticks.

 

[sdhaku]

Take a look here:

https://www.gigabyte.com/Motherboard/GA-EX58-UD5-rev-10/sp#sp

It appears the board may not properly allocate 8GB sticks.

That's interesting. I do see "

• 6 x 1.5V DDR3 DIMM sockets supporting up to 24 GB of system memory (Note 1)

Due to Windows Vista/XP 32-bit operating system limitation, when more than 4 GB of physical memory is installed, the actual memory size displayed will be less than 4 GB."

I'm pretty sure I'm running the 64-bit version of Win7 Pro and even so shouldn't I still see at least 24GB available?

 

[punkncat]

That's interesting. I do see "

• 6 x 1.5V DDR3 DIMM sockets supporting up to 24 GB of system memory (Note 1)

Due to Windows Vista/XP 32-bit operating system limitation, when more than 4 GB of physical memory is installed, the actual memory size displayed will be less than 4 GB."

I'm pretty sure I'm running the 64-bit version of Win7 Pro and even so shouldn't I still see at least 24GB available?

I also am curious about that, but they are stating in 'black and white' that the system can't use that much RAM. Perhaps take out pairs of sticks until it coincides, if at all?