OC'ing Shaders ATI vs Nvidia

J

jedihobbit

Gawd
Joined
Nov 3, 2005
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963
With all of my builds somehow haven been sucked in the vortex of 24/7 folding, this has become the new “obsession” for me……..eking out the last bit of PPD within my abilities. :rolleyes:

GPU2 folding has made this quit easy as it seems bumping up the shader freq. is the deal. I have three units folding gpu…… 1 x 9600GSO, 1 x 8800GT SC, and 1 x HD3870. Now the nvidia guys are easy as snit to do, go into RivaTuner and move the slider. However there seems to be nothing for the ATI guy! What am I missing, as shader freq. has to be part of ATI’s process too….or am I delusional?

On average so far I have managed (with a std 384 pt client) to shave off 14 seconds per 1% with the GSO. With the GT SC I’ve shortened the average time by 7 seconds (still playing there! :eek: ). I would love to do something with the 3870 as it seems to keep getting units with values above 500 pts and takes twice as long to run.
 
Only nvidia use a seperate clock for core, memory and shader, ATi's shader clocks are not seperate and run at the core clocks.
 
necrophile said:
Only nvidia use a seperate clock for core, memory and shader, ATi's shader clocks are not seperate and run at the core clocks.
Click to expand...

Right. This means that for ATI you have to overclock the core clocks (you can do it in the ATI control panel) to get the shader units to overclock. It's all coupled together... no separate clock domain like necrophile said.
 
As usual I've gotten impatient waiting on an akasa's VORTEXX Neo – COOL BLUE VGA COOLER (Saturday or 1st part of next week) and started fooling around with the Sapphire 3870. March of '08 my great sale price was $185! :(

1st off what would be "too hot" for this card as I can't seem to find anything when I google? Right now it seems to be bouncing around 76C (75 - 77) with fan at 100% and current overclock of 810 (776) / 1170 (1126).

BTW is there a rule of thumb for a ration between core and memory clock speeds? Meaning if I oc the core by 10% what do I oc the memory?
 
There is no ratio between core and memory speeds. You can overclock them completely independently of each other. As for the maximum temperature, I would personally try and stay below 85-90C.
 
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