I've got this PC:
AMD Athlon 2500+
Sapphire Radeon 9600 pro
1 GB RAM

I can't play at 1024x768 (16 bit colors) and HIGH quality because the games slows down too much.
If I turn quality to MEDIUM it's all ok.

But in every case I notice some really boring flickering on the grass patch, especially playing in S.Siro Meazza stadium with weather set to Dry/Summer.

I've tried installing latest ATI drivers but they don't seem to improve the situation.