Far Cry 3 will be able to run on PC rigs with 512MB of video RAM and 4GB of memory, although it'd be nice to have 1024MB, and it'd be really ideal if you had the latest DirectX 11 graphics card and 8GB of memory. Below find the official Far Cry 3 PC requirements, broken down into "minimum," "recommended" and "hi-performance," with AMD and Nvidia examples for each.
Far Cry 3 will need to be activated once via Ubisoft's Uplay, but doesn't require an always-on internet connection to run through the single-player campaign (in offline mode, obviously). Now that your DRM-panic-attack meter has settled, see if your PC is up to the challenge after the break.
Minimum Specs
DirectX9c graphics card with 512MB Video RAM
Dual core CPU
4GB Memory
Example minimum 1 (NVidia/Intel)
NVidia GTX8800
Intel Core2 Duo E6700
Example minimum 2 (AMD)
AMD Radeon HD2900
AMD Athlon64 X2 6000+
Recommended Specs
DirectX11 graphics card with 1024MB Video RAM
Quad core CPU
4GB Memory
Example recommended 1 (NVidia/Intel)
NVidia GTX480
Intel Core i3-530
Example recommended 2 (AMD)
AMD Radeon HD5770
AMD Phenom II X2 565
Hi-Performance Specs
Latest DirectX11 graphics card
Latest quad core CPU
8GB Memory
Example hi-performance (NVidia/Intel)
NVidia GTX680
Intel Core i7-2600K
Example hi-performance (AMD)
AMD Radeon HD7970
AMD Bulldozer FX4150