A quick question regarding clock frequencies on cards. I got a HD4850 and the BIOS has the following frequency presets:
- Boot-up 625/993
- "2D" 500/700
- "3D" 750/1100
With fglrx the card switches between the modes fine. With the radeon driver the xorg.0.log reports clocks of 625/993, so I take it the driver reads the boot-up frequencies from the BIOS. My question is, does the card ramp up to "3D clocks" as specified in the BIOS or does it simply read the first preset and ignores the rest? I ask because I'm about to make comparison benches for 3D performance between the two drivers and I would like to keep the card at the same frequencies for both tests.
- Boot-up 625/993
- "2D" 500/700
- "3D" 750/1100
With fglrx the card switches between the modes fine. With the radeon driver the xorg.0.log reports clocks of 625/993, so I take it the driver reads the boot-up frequencies from the BIOS. My question is, does the card ramp up to "3D clocks" as specified in the BIOS or does it simply read the first preset and ignores the rest? I ask because I'm about to make comparison benches for 3D performance between the two drivers and I would like to keep the card at the same frequencies for both tests.
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