System Requirements

System Specs	Minimum Specs	Recommended Specs
OS	Windows XP or higher
CPU	Pentium 4, Dual Core	Pentium 4, Dual Core 1 GHZ
RAM	4 GB	16 GB or More
HD Space	Over 4 GB Free Space
Video Card	Nvidia 7600 series	Nvidia 8000 series
DirectX Version	9.0C or Higher

Source: http://dragonnest.nexon.net/support/faq/203/00CG1/what-are-the-minimum-recommended-specs-for-dragon-nest