Linked by Thom Holwerda on Thu 14th Dec 2006 22:19 UTC
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Member since:
2005-07-06
If you're using the DRI open source drivers, the Intel machine with the Radeon 8500 uses the r200 driver, and the AMD machine with the radeon 9800 uses the r300 driver.
The r200 driver was developed with full access to the GPU specs and errata, and with some engineering support by ATI developers, so it is known to perform well and AFAIK there are no stability issues or missing features.
Then ATI managers decided that they didn't want to release specifics to open-source developers anymore, not even under NDA, so the r300 driver has been written exclusively by reverse engineering the windows driver. Most cards work well, and it is fairly stable, but there are some GL extensions not fully optimized or unimplemented. This could explain the bad performances.
IIRC, the Radeon 9800 it's a specially unlucky card, because it seems to be initialized in a strange way, and the developers until not long ago didn't really grasp how to make it work.
Edited 2006-12-15 19:42