Have 128gb RAM but I can't even use 10% of it

I do use heavy ram eating programs, AutoCAD, MicroStation, ScanMaster, etc... I work with large drawings with even larger ariel images attached and work with surveyed point clouds that have tens of millions of points in each. I know there are software limitations where some software cant use more that a certain amount of memory but it seems like I should be able to use more than 11.4gb. My previous system had 16gb of ram and the only issues I had with memory was hard disk too small to allow large page files, once we installed larger hard disk that issue went away.

Have done full diagnosis on the whole system using the Dell software (F12 @ boot up) and everything tested good, except the software said it could not find the hard drive. All memory, procesor, cooling fans, etc... tested good.

The problem with the error message received is that it is too generic in nature, referring to a shortage of "memory" when the actual problem could be a number of very different things. A shortage of RAM is actually the least likely of the causes. RAM shortages rarely cause any problems other than poor performance. In this case it hardly seems likely, particularly when usage rarely goes above about 10%.

Typically the cause of such errors is reaching the commit limit. But when the screenshot shows a commit charge of only 7 GB with a limit of 255 GB that seems highly unlikely.

Another possibility is when a process reaches the limit of it's virtual address space. For a 32 bit process that is a maximum of 4 GB, and that only if it is Large Address Space Aware, which most are not. But with a 64 bit process that address space becomes 8 TB (8192 GB), completely independent of how much RAM you have. Reaching that sems unlikely.

Can we assume that the applications concerned are all 64 bit?

A more reasonable possibility is reaching the limits of the desktop heap. Unfortunately my knowledge of that is very limited.

Thanks for all of the help, I really do appreciate it.

You are correct, all of my heavy RAM programs are 64bit versions.

Attached is my Virtual Memory settings. F.Y.I. my C: is a 1tb SSD with 655gb free and the G: is a 2.72tb (SATA?) with 2.68tb free.

I think that SPECCY was wrong on the 7 slots used, now it does not show any info on the slots. The motherboard does have 8 slots filled, it says Samsung, Planet First, G2. I cant see the label on all of them but they all appear to be the same chip. I think there is another processor slot and 8 more memory slots under the cover, all empty.