You just canít use 4x FSAA on a GeForce 7950 GT because this card doesnít notch 50fps even in 1280x1024. The Radeon X1900 XT, on the contrary, is close to the necessary level of performance, although it fails in the higher resolutions, too.
Being less demanding than Prey , this game provides a more favorable environment for the graphics cards to race in. The GeForce 7950 GT shows an acceptable speed in 1600x1200, outperforming the Radeon X1950 Pro by 17-18%.
The Radeon X1900 XT feels at its ease even in 1920x1200, but do not forget that we are benchmarking its version with 512MB of graphics memory. The cheaper 256MB version may have produced different results.
Serious Sam 2
Serious Sam 2 needs 512 megabytes of graphics memory to run fast. Thatís why the GeForce 7950 GT is far ahead of the Radeon X1950 Pro in two out of the three resolutions, but is slower than the Radeon X1900 XT.
If even the X1900 XT cannot yield 60fps in 1280x1024, you should better give up using FSAA here. Your lowering the level of detail in the game settings would worsen the gameís visuals more.