1. Open Steam and left-click on 'Library'.
2. Right-click on Arma 3, left-click on 'Properties'.
3. In the Properties Dialog box, left-click on the 'General' tab (if not already on it).
4. Left click on the 'SET LAUNCH OPTIONS...' box.
5. In the 'Launch options - Arma 3' dialog box input the following in 256 byte increments (without parenthesis of course):

"-maxMem=<System RAM up to 4096> -maxVRAM=<Video card memory>"

• for example, my options look like this:

"-maxMem=4096 -maxVRAM=2048"
If look around you can find posts about other options such as '-cpuCount=<# of logical CPUs in the system>' or '-exThreads=7' to specify how the game uses the hardware and startup options; but my system seems to hyperthread and run across all processors just fine without any further options. Also, you'll see people who claim putting in more than 4Gig of system RAM (if you have it) will help, but I haven't witnessed a difference. This option wouldn't override the OS limits anyway. I'm a network guy, not a PC guy so I could be wrong.

6. After specifying the options, left-click okay to get out of the 'Launch options - Arma 3' dialog box.
7. Returning to the 'Arma 3 - Properties' box, click on the 'CREATE DESKTOP SHORTCUT' button.
8. Use the new shortcut to to launch the game.

In the interest of "full disclosure" my game did lock up after about 45 minutes the first game I played after updating the post. At that point, I took the options out before my reboot. I locked up twice within the first hour without them. Put them back in and didn't lock up until I shut things down 3 hours later.

If I lock-up again, I'm going to reduce one of the options by 256bytes and see if that makes a difference. Of course, I will need to do some actual work at some point too.

Last night I specified my video memory using the -maxVRAM=2048 attribute. I also dropped my max memory value to just use 4Gig with the -maxMem=4096 attribute. Strangely, I have not crashed since. Several servers I have been on have crashed, but I have not crashed locally. I'm hoping it's not luck.