Sorry about the late reply, I have been quite busy with work this week.
1) the module, if it is plugged into a PCIE slot or somesuch should be transferrable to a new MOBO if needed. 3) I would try the graphics card on the MOBO you have now, and see what kind of performance you get (Just make sure to enable the dedicated graphics card from the BIOS). Then, if it doesnt work, jump for the new MOBO. As long as it has all the plugs you need, then no need to spend money on upgrading something that will make only a small difference to the rig.
This is my 2 cents, i am hardly an admin of this site, or someone who has done this lots. I DO work in the IT field, and that is what I would do, were I in the same situation.
hmmm... im a little less sure on swapping out for a pre-built PC from a vendor, but if what I am seeing is correct you have an Acer Pre-built ATC-605-UB12 right?
so a couple of questions. 1) you mentioned that the one IN there has Wireless internet... is this something you are needing to continue to have? (either built in or purchase an add-on) 2) is the Mobo bad or are you just trying to upgrade? 3) if you are just trying to upgrade, what is the goal? 4) you mentioned that you might get a video card, is there a slot there in the unit for one?
like i posted in the other one (which i am suspecting is SPAM based on this one showing up again, pretty similar in wordage) the small size of the screen is a concern for those with less than perfect eyesight...
thats pretty cool, but unless it has video outputs to bigger screens, not much use to me anyways, that text looks TINY! lol. But amazing what they can fit in so small a box eh?
Try looking at the Mini factor PC's from dell. Those are beastly. The size of a thin client (smaller than most women's purses), but with an I7 processor and 16 gigs of RAM plenty of beast for any business related need. Only downside is lack of a CD drive, which can be mitigated with a USB port DVD drive which can be mounted as needed.
I had the same problem with my PC i built initially. First it was not using all 16 gigs of ram (one of the ports on the MOBO for the RAM was bad), then it was the graphics card. Basically it was NOT using the dedicated graphics card, which was causing it as the integrated just could not handle it.
Now it seems like you have checked a couple of these, but i would verify the following: 1) is the graphics card being utilized? 2) can you run a graphics card test on it, from the manufacture and see how it performs? 3) RAM test via Windows Memory Diagnostic (search from the start menu). let it run at a reboot, and see what the results say. It SHOULD pop up at a reboot, but if it doesnt, search Event Viewer -> open it, Windows Logs > System > click find on the right hand side, and search for "MemoryDiagnostic" the box should say "The Windows Memory Diagnostic tested the ccomputer' memory and detected no errors. now that i think about it, just go here and follow these instructions, try both to be sure that there are no errors: http://www.howtogeek.com/260813/how-to-test-your-computers-ram-for-problems/
IN MY OPINION: It is POSSIBLE that the RAM is partly to blame, as DDR3 is slightly outdated, but im thinking not. 16 gigs is plenty for all you seem to be using it for (I play Skyrim at high settings, though i do turn the lighting up since i hate not being able to see at night, haha) CPU does not seem to be an issue either, 860W should be more than enough for your usages. I am using an i5 midgrade, and so i am doubting it is the processor, especially if it is passing the stress tests.