My speculation of the minimum system requirements due to the upgrade of the engine would be: 2.4 GHz dual core processor 3GB RAM for Windows Vista/7 25 GB of hard drive space (all DLC to be released) 512 MB GFX with 4.0 Pixel shader DirectX 10.1
A Mass Effect 3 demo for the highly anticipated sci-fi RPG, which will conclude the enormously popular trilogy from EA and Bioware, will be available for download during the month of Janaury 2012 announced developer BioWare via the official Mass Effect 3 Facebook page of the game.