Re: [Dri-devel] Re: overclocking of mach64

[Nicholas L. <ni...@by...>]

On Saturday 17 August 2002 07:43 pm, Smitty wrote:
> As you have stated there is no overclocking SW for your 3D HW under Linux.
> 
> But you can alter your card's BIOS / firmware to specify a differnt 
clockspeed.
> 
> First figure out the appropriate clockspeed for your card. I Just use a 3D 
game
> eg UT for a bit to get a load going and check stability.
> 
> Then get hold of the ATI card BIOS flash utility.
> 
> Boot of a DOS disk - DRDOS
> 
> Copy your card's bios to a file.  
> 
> Use a BIOS editor to edit this file with the values wich you determined 
earlier.

And where would one get a 'BIOS editor' ?
Hex editor is simple, but knowing which bits to twiddle is the $million
question.

> 
> Save the BIOS upload the BIOS to your card ie flash it.
> 
> Hope it works.
>  
> This is the same as what I told some guy on this list who wanted to 
underclock
> his mach64 for stability, never heard anything from anyone after that 
email... 
> 
> btw the memory timings (on a radeon at least) ie slow / fast have no impact 
on
> performance, unfortunately they seem to have little impact on the o/c 
ability
> of the memory (maybe the software didnt actually change them?).
> 
> I run my radoen at 180/180 instead of its original 159/159 with stock 
cooling
> even though it was stable (no artifacts) at 189/189 but the Radeon is a cool
> running card I dont know about the Mach64 never having owned one. 

And can you tell that 180 vs 159 gives a significant performance difference?
What about vivo cards, would changing the timing affect video capture at all?


Nick