Fifa Online Minimum Requirements
Internet Explorer Portal IE7/IE8, Firefox 3 and 3.5 are supported.

OS: Microsoft Windows XP / Vista / 7

CPU: 1.7 GHz or above
RAM: 500MB or above

Graphic card:
ATI 9800 or above
Nvidia 5900 or above
Intel 915 or above
VRAM 64MB or above
Shader mode 2 or above

Hardware acceleration setting is required
Color system setting 32 / 24 bits.