FSAA
FSAA Performance
Again, using SS:SE's Citadel demo, with the Extreme addon, under OpenGL we'll take a look at the performance of the various AA modes available on the Xabre 400.
| OpenGL | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| None | 67.0 | 74.4 | 56.2 | 37.0 | 26.4 |
| 2X | 46.8 | 49.3 | 36.8 | 25.3 | 16.8 |
| 3X | 28.6 | 36.3 | 26.0 | 17.3 | 4.1 |
| 4X | 28.0 | 35.4 | 25.3 | 17.1 | 4.0 |
| Diff from none | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| 2X | -30% | -34% | -35% | -32% | -36% |
| 3X | -57% | -51% | -54% | -53% | -84% |
| 4X | -58% | -52% | -55% | -54% | -85% |
| DirectX | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| None | 71.0 | 65.4 | 52.1 | 36.7 | 26.4 |
| 2X | 59.7 | 54.5 | 45.0 | 32.3 | 23.3 |
| 3X | 28.6 | 20.4 | 13.4 | 8.3 | 6.4 |
| 4X | 29.0 | 20.4 | 13.4 | 8.3 | 6.4 |
| Diff from none | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| 2X | -11% | -27% | -20% | -13% | -12% |
| 3X | -57% | -73% | -76% | -78% | -76% |
| 4X | -57% | -73% | -76% | -78% | -76% |
Both OpenGL and DirectX appear to follow similar patterns, with 2X FSAA mode having a reasonable drop from normal rendering (although this is greater under OpenGL), a further drop for 3X, and then 4X is about the same performance as 3X.
