Being new to the forum I still cannot start a new topic, while feeling sorry for that I still feel the need to give some feedback about the port.
My setup:
CPU: AMD Phenom II X4 965, not overclocked, factory heatsink;
MOBO: Gigabyte GA-870-USB3;
RAM: 4GB DDR3 on two banks @ 1333MHz (already ordered another 4 GBs, the game's on the edge of memory);
GPU: nVidia GTX 660 w/ 2GB GDDR5 memory (asus);
HDD: 1TB WD 7200rpm 64MB cache;
OS: Debian 9 Stretch (testing) 64-bit, using nVidia driver 375.26 and MATE desktop environment;
Playing Arma3: APEX with all DLCs, version 1.64;
The game works like a charm on my almost 6 years old pc. I've been using ONLY GNU/Linux systems for the last 9 years, only kept a PC running Win7 for ArmA2, played Operation Flashpoint Cold War Crisis via Wine and/or an old 2001 AMD sempron PC, I cannot tell how glad I am to be playing ArmA3 natively on my Debian box.
Notes:
I had to lower the settings, but I do believe it is due to my RAM. If OpenGL could take advantage of the full 4GB offered by the Arma3 process to store its 700+ MB of VRAM it would run more smoothly. I will give an update as soon as the further 4GBs I ordered will be placed in my setup.
Yesterday the game played at 45+ FPS as an average with my setup.
The GPU (and maybe the RAM) I currently have prevent me from playing the game in 1080p, playing 1280x1024 with resized screen (no stretching at all). Again, I will give more feedback about that after the little upgrade I mentioned earlier.
I hope the port will keep on growing, eventually reaching a 64bit status.
Keep on rocking!
Jack
EDIT: forgot to mention: my GPU has fried the fans. It is very likely that an infamous bug steam was fairly known for has hit hard my GPU, I used nylon lashings to fasten an old fan I found the in junk to the GPU that now seems to be working nicely (LOL)