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Because of the bug we mentioned earlier, we had to restart the game everytime we change graphical settings - AA, AF, and resolution. We noticed no performance loss with level reloads, so thankfully there's no bug there. You should be able to get the most out of Crossfire with normal gameplay. Just remember you need to restart the game after applying system changes or executing 'vid_restart'.

Crossfire really shines, offering significant frame rate gains in graphically limited situations. We can see gains between 40 to 60 percent in mininum fps with default and AA AF enabled, respectively. On average, the gains are smaller, but still significant - 30 to 50 percent and we're only talking about 1024 x 768 results. With higher resolutions, the gains become more significant - basically 60 to 70 percent on minimum fps (under default and when AA AF is enabled) 40 to 60 percent with average fps. At 1600 x 1200, we practically have double the performance of a single card.


Quake 4 - Data Processing Terminal 1024
(click here for a more detailed graph)

	Crossfire	Single X1950 Pro
<30 fps	0	0
30-45 fps	0	0
45-60 fps	0	2
60-90 fps	0	9
90-120 fps	3	16
>120 fps	22	9
Total	25	36

results are in seconds

The fps progress graph and table above shows how staggering the frame rate we gain with Crossfire. Instead of dropping to about 50 fps, we only dropped to around 100 fps with two Radeon X1950 Pro. For the most part of the benchmark, we saw frame rates around 150 fps compared to 100 fps with single card setups.

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