Bandai Namco has posted the minimum and the recommended system requirements needed for Dark Souls 2 version for PC.

So, here it is what you need to have in case you want to run the game:

The PC version of Dark Souls 2 will be released on April 25, 2014, a month later after the console version.

Minimum

• OS: Windows XP SP3, Windows Vista SP2, Windows 7 SP1, Windows 8
• Processor: AMD Phenom II X2 555 3.2Ghz or Intel Pentium Core  2 Duo E8500 3.17Ghz
• Memory: 2 GB RAM
• Graphics: NVIDIA GeForce 9600GT, ATI RadeonHD 5870
• Hard Drive: 8 GB available space
• Sound Card: Compatible with DirectX 9.0c or higher
• Network: Internet connection required for online play and product activation

Recommanded

• OS: Windows 7 SP1
• Processor: Intel CoreTM i3 2100 3.10GHz or AMD A8 3870K 3.0GHz
• Memory: 4 GB RAM
• Graphics: NVIDIA GeForce GTX 465 or higher, ATI Radeon HD 6870 or higher
• Hard Drive: 8 GB available space
• Sound Card: Compatible with DirectX 9.0c or higher
• Network: Internet connection required for online play and product Activation

Source: VG247