Built with Real Virtuality 4, ARMA 3 builds on its predecessors' superb graphics and realism, DirectX 10 and 11 support, improved physics across the board, underwater environments, volumetric clouds, better lighting and a 20km view distance with photo-realistic terrain.
ARMA 3 will offer the largest official terrain of its franchise, with ground area covering approximately 270 km² across the Aegean islands of Altis and 20 km² on the Greek island Stratis. Between its expansive world and graphical advancements, it's no surprise that the developer's recommended specifications are set relatively high.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips