AnarchX
2006-11-02, 22:35:16
ATI X1950 Issue: CrossFire and Standard Card Render Differently?
[...]
So while these timedemo runs don't represent real game play, they are incriminating none the less. Quake 4 shows a 41% performance hit when in the "real" 4xAA mode on the CrossFire card that the standard card doesn't get hit with. In Doom 3, the same is happening at a 41% performance delta as well.
Whether or not this was an accidental bug or something else, there are probably numerous reviews online about the X1950 XTX cards that need to be re-evaluated, my own included. Any readers or reviewers that were overly impressed by the X1950 XTX's performance in OpenGL applications (possibly just limited to the Doom 3 engine) need to run these kinds of tests themselves to see if their results are tainted by this error. Hopefully ATI will address this issue quickly and in the right manor!
http://www.pcper.com/index.php#NewsID-3049
Da wird nun auch wohl klar warum, die X1950XTX bei CB schneller ist als eine 7950GX2 z.B. in Prey 2560x1600 4xAA/16xAF:
http://www.computerbase.de/artikel/hardware/grafikkarten/2006/test_msi_geforce_7900_gto/15/#abschnitt_prey
Scheint wohl etwas mit dem Hierarchical Z buffer zu tun zu haben, der bei 2560x1600 4xAA nicht mehr ausreicht:
http://www.beyond3d.com/forum/showthread.php?p=864449#post864449
[...]
So while these timedemo runs don't represent real game play, they are incriminating none the less. Quake 4 shows a 41% performance hit when in the "real" 4xAA mode on the CrossFire card that the standard card doesn't get hit with. In Doom 3, the same is happening at a 41% performance delta as well.
Whether or not this was an accidental bug or something else, there are probably numerous reviews online about the X1950 XTX cards that need to be re-evaluated, my own included. Any readers or reviewers that were overly impressed by the X1950 XTX's performance in OpenGL applications (possibly just limited to the Doom 3 engine) need to run these kinds of tests themselves to see if their results are tainted by this error. Hopefully ATI will address this issue quickly and in the right manor!
http://www.pcper.com/index.php#NewsID-3049
Da wird nun auch wohl klar warum, die X1950XTX bei CB schneller ist als eine 7950GX2 z.B. in Prey 2560x1600 4xAA/16xAF:
http://www.computerbase.de/artikel/hardware/grafikkarten/2006/test_msi_geforce_7900_gto/15/#abschnitt_prey
Scheint wohl etwas mit dem Hierarchical Z buffer zu tun zu haben, der bei 2560x1600 4xAA nicht mehr ausreicht:
http://www.beyond3d.com/forum/showthread.php?p=864449#post864449