To everyone having this issue, I hope I can provide you with a possible fix for you if you have not already tried it yourself.
Specs:
i7-2600k (3.4GHZ) @ 4.2GHz - H100i
G1 Sniper v2 LGA1055
2xGTX580 (795Mhz) SLI @ 900Mhz - Accelero Hybrid GPU AiO Liquid Coolers
Ripjaw X 4x4GB (16GB) RAM - Dominator RAM Cooler
Now I'm not sure if everybody here has overclocked their GPU's or not but after trying EVERYTHING I read over BI forums and others I came across another suggestion I thought I'd try out because I was just so ridiculously keen to play this since the Alpha version. I tried underclocking CPU/GPU's, running single/dual cores through the launcher, setting RAM speeds to default, running optimized / standard defaults through BIOS, reinstalling DirectX drivers manually through ARMA 3 folder in stored drive, reinstalling ARMA 3... and much more. Just... EVERYTHING..
This morning I read to reduce GPU clocks to factory standard (if not already) and bumping up the core voltage by 2-5%. So I bumped up the factory voltage of 1000mV to 1050mV.
(My cards have been known to support up to 1150mV. Ranges up to 1100mV's are 24/7 overclock voltages so I'm in the very safe range. Being both liquid cooled, they operate at a maximum of 55*c on an incredibly warm day even with the Fermi GF110's being well known for their heat)
Had the game running for 20 hours now flawlessly whilst all my settings areat Ultra/maximum CPU count/etc.. Hope this helps at least some of you out there.
(p.s. Both cards are still in SLI configuration)
(p.p.s. Please do this at your own risk >_<)
(p.p.p.s I used MSI Afterburner)