Minimum Requirements for a PC to run Uncharted Waters Online smoothly is as following:

OS: Windows XP SP2 and above
Processor: CPU Pentium3-800MHz or above
Memory: 256MB or above
Hard Drive: 1GB Hard Disk Space
DirectX: DirectX 9.0c or above (VRAM : 32MB or above)
Sound: 16 bit stereo 44KHz WAVE compatible sound card
Display: 800x600 or above, High Color display
Network: 1M bps or above