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About crossfire o/c limits

post #1 of 5
Thread Starter 
hi guys,

i am using 2x6870 in my crossfire setup..and i tryed trixx and msı ab for overclock..and i have this problem,

everything normal when i going to o/c my cards in o/c limits..trixx or msı ab or ccc..its 1000mhz is limts for 6870 in all programs..and powerplay working excellent

but
when i try to over 1000mhz for my gpu like example 1001 powerplay doesnt work well..and 1 of the cards going to o/c speeds all the time..doesnt turn back idle clocks(300-300)

is it normal or am i doing somethıng wrong?


ty----


example

in o/c limits enable unoffıcal overclocking off(gpu 1000 mem 1100)



(idle )
gpu1 300 mem 300(under 3d gpu 1000 mem 1100)
gpu2 300 mem 300(under 3d gpu 1000 mem 1100)


everything ok,

-------

over o/c limits enable unoffıcal overclocking on(gpu 1010 mem 1100)

(idle)
gpu1 300 mem 300
gpu2 1010 mem 1100

???


1 card already working on o/c speeds when i am going to overc 1000mhz in all programs.doesnt back low speeds in idle mode.so any idea?
    
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post #2 of 5
Welcome to the club. Same issue I am facing with MSI Afterburner. I have tried every trick I know to the point of crashing my drivers and having to re-install windows. No fix in sight. Posted in guru3D forum as well. No response. Compudaze, a member here, also posted about the same problem. Also, if you pay attention, if you used MSI AB and used the sync button, the OC in your second card does not stick.
Bottomline, if you are looking for OC in a crossfire configuration, you will have to look somewhere other than MSI AB. Now, I have no experience with Trixx.
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post #3 of 5
Try doing it with CCC?

I'm only using 1 card and my idle clocks are a little too high to be honest also with MSIA.
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post #4 of 5
Single card is just fine with AB. But xfire does not play good with AB. And yes, you can use CCC, but you are limited to 840 core and 1325 mem. Unless ofcourse you mod registry key or use ASUS smartdoctor to increase those limits.
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by Awaz View Post
Single card is just fine with AB. But xfire does not play good with AB. And yes, you can use CCC, but you are limited to 840 core and 1325 mem. Unless ofcourse you mod registry key or use ASUS smartdoctor to increase those limits.

ty guys..ty Awaz


yea i tryed sapphire trixx but same..second card going to o/c speeds when i o/c over 1000mhz gpu..all same..

so there is a 2 option here..

1-o/c crossfire cards to o/c limits..1000mhz for 6870..dont go over 1000 and use them same speeds idle and load

2-o/c crossfire cards max limits over 1000mhz gpu..but this time second card going to work o/c speeds all the time ..doesnt turn back idle speeds..so you wasting more watt and have more temp for your setup,,


Awaz do you know how many watt wasting cards o/c speeds but not load %100?

like example(talking about 6870)

idle gpu 1000 mem 1100 but not load %100
    
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Amd phenom x4 965 c3 4ghz(260x15.5)1.520v GA-890FXA-UD5 Asus-Sapphire HD6870 Crossfire(1000x1120-1.237v) 2x2 Gb Kingston hyperx DDR3 1333@1732 
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