At minimum, the PC shooter demands Windows Vista SP2 with dual-core AMD or Intel processors, 4GB of RAM, and a 512GB GeForce 8800 GT or Radeon HD 3870 graphics card.
It's a big old leap to what's recommended: Windows 8 to start off with, and either a six-core AMD or quad-core Intel processor, supported by 8GB RAM and 3GB graphic memory. DICE suggests Radeon HD 7870 and GeForce GTX 660 graphics cards.
Oh, and make sure you've got 30GB spare of disk space spare. You can check out the full specs after the break, but don't forget, you have a plenty of time to gear up your PC before Battlefield 4 is released on October 29.