3) I can enable more pipes for r420 cards, but am unable to test it on 420 cards with fewer pipes.
Do I just add this and wait for someone to complain?
A better way would be to read carefully specs of R4xx cards on ATI website to find out how many actual pipes are available :)
This page is more helpful: http://www.rojakpot.com/default.aspx?location=3&var1=88&var2=0
pipes value My card 16 (7 < 1) max R300 8 (3 < 1)
Why do you the value is 7 ? According to my docs the number of pipes is a magic value that should be architecture dependent. Of course, my documentation is for R300 2d only..
I would expect that there is no easy formula.
The 7 came from fglrx using radeon_dump. By the way R420 is very sensitive to register reads of some registers.
If the value should be architecture dependent it should be safe to use the value 7 on all R420 no matter the number of pipes.
Rune Petersen
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