That's odd.. When you say system reporting apps, you mean like Speccy? How about in Task Manager? You are definitely looking in Preferences for Photoshop 64bit? I am sure you are. What version of Photoshop?
Thanks Trevor, looks like a Windows issue or perhaps a MB issue, not sure why but for some crazy reason 16gig is "Hardware Reserved". Guess I now have to reseach that - ugh!
My first stop would be into the BIOS via SETUP at boot. Check everything there.
Also, check that you have populated the correct slots on the MoBo, with the correct RAM sticks.
You might also find one, or more of the tools in this ARTICLE useful for checking things.
I've checked the bios, can't find anything related to shared memory and the MB is fully populated with the pair memory. I've posted the issue on both the MB makers site and the Custom Systems Builder's - so hopefully an answer and solution soon
There are lots of hits if you Google 'RAM hardware reserved'.
Is this Windows 7 Home Premium? That is throttled to 16 GB RAM. You'll need at least Professional to see more.
Nail on the head, Bingo! Thanks Tim, had no idea MS would cripple the Home Premium edition that way, stupid beyond words, but now MS gets another chance to reach into my pocket. O'well I guess I don't feel too bad about it since I've been using a few of there free MS Research products too.
Stupid? They're actually going to get money from you, right? Did you forget that Microsoft is a business? The memory maker got money from you, why shouldn't the software maker as well?
It may not be pleasant to think that such limitations are arbitrarily imposed, but the limitations of the various versions are there and have been published plainly for a long time. For example:
Note the link to the description of the Windows Anytime Upgrade in the second paragraph at the above link. That will be your path to using that extra memory.