Here are the Assassin’s Creed: Director’s Cut Edition System Requirements (Minimum)
CPU: Dual core processor 2.6 GHz Intel Pentium D or AMD Athlon 64 X2 3800+
RAM: 1 GB
VIDEO CARD: ATI RADEON X1600** /1650**- 1950/ HD 2000/3000 series, NVIDIA GeForce 6800**/7/8/9 series. **PCI Express only supported. Laptop versions of these cards may work but are NOT supported. These chipsets are the only ones that will run this game. For the most up-to-date requirements, please visit the FAQ for this game at: http://support.ubi.com.
OS: Windows XP/Windows Vista (only)

Assassin’s Creed: Director’s Cut Edition Recommended Requirements
CPU: Intel Core 2 Duo 2.2 GHz or AMD Athlon 64 X2 4400+ or better recommended
RAM: 2 GB
VIDEO CARD: ATI RADEON X1600** /1650**- 1950/ HD 2000/3000 series, NVIDIA GeForce 6800**/7/8/9 series. **PCI Express only supported. Laptop versions of these cards may work but are NOT supported. These chipsets are the only ones that will run this game. For the most up-to-date requirements, please visit the FAQ for this game at: http://support.ubi.com.
OS: Windows XP/Windows Vista (only