Yes, too much RAM can be a problem. FIFA 06 is a 32-bit executable with memory address limits. On a system with 16GB+ of RAM, the game occasionally fails to allocate texture memory, resulting in "flickering green pitches."
Technical Evolution: An Analysis of FIFA 06 System Requirements The release of (also known as FIFA Soccer 06 fifa 06 system requirements
To get the best performance out of FIFA 06, there are several things you can do to optimize your computer: Yes, too much RAM can be a problem
The hardware requirements for FIFA 06 vary slightly depending on whether you are using the CD-ROM or DVD-ROM version, primarily impacting the required disk space. FIFA 06 Soccer PC Game - Newegg.com FIFA 06 Soccer PC Game - Newegg
Run the game in Windows XP SP2 compatibility mode and force "640x480 resolution" in the compatibility tab before launching.