@ Flanker
http://forum.1cpublishing.eu/showthread.php?t=7705
Its the same for Nvida too
Concentric rings
ATI & Nvidia have suffered with driver and hardware updates.
IL2 1946 needs a graphics dll update to remove the water ring on Nv cards in perfect mode and to fix the ATI purple trextures and general corruption.
You gave to be careful though as some of these glitches on ATI are purely driver related.