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Very interesting AMD 6990 problem.

Last response: in Overclocking
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November 23, 2011 5:32:53 AM

Hello everyone, long time reader first time poster.

So basicly my question(s) is/are about the amd 6990 video card.

I have 2 of them from XFX in my setup, they are being powerd by the silverstone strider 1500 watt silver cert PSU.

However, when i turned of my pc last night, and for the first time switched the 2 OC switches to the ''second stage'' to go from both video cards 830mhz to 880 i think it is.

And then turn my pc back on, everything is fine i dont get no errors, bluescreens or whatever, HOWEVER, when i open up MSi after burner OR catalyst center, the stats are still on stock settings.

So could annyone tell me what the problem could be that the oc switches arrent ''working''?

Annyone had anny experience with this ?
a b U Graphics card
a b K Overclocking
November 23, 2011 4:12:04 PM

its either
1. msi afterburner/CCC are taking over the o/c
2. its not overclocking coz of ^^^^^^^^^^^
or 3.there just reading what their told to do :p 
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November 23, 2011 6:42:43 PM

nna2 said:
its either
1. msi afterburner/CCC are taking over the o/c
2. its not overclocking coz of ^^^^^^^^^^^
or 3.there just reading what their told to do :p 



Wel, if msi or CCC did wich i highly doubt, then they would show the stats being bumped up, but the stats are still on stock settings.

And i diddent realy quite get yoursecond and 3'd one :S
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a b U Graphics card
a b K Overclocking
November 24, 2011 1:04:55 AM

hehe, sorry this was written in a daze last night
i meant, there just showing the stock settings
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November 24, 2011 5:14:57 AM

nna2 said:
hehe, sorry this was written in a daze last night
i meant, there just showing the stock settings



With al due respect, but that did not help me one bit :p 


Surely there is someone out there who atleast has 1 6990 switched and can be of help :) 
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a b U Graphics card
a b K Overclocking
November 25, 2011 1:32:28 AM

okay, get gpu-z, google it, near the bottom it should show you gpu clock and default clocks, if the gpu clock is higher then guess what....
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November 25, 2011 5:14:54 AM

Wel no ish Sherlock Holmes :p  Both CPU z and CCC and msi afterburner dont show it, im here for answeres not logic i already know man :p 
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November 25, 2011 11:47:31 AM

nna2 said:
okay, get gpu-z, google it, near the bottom it should show you gpu clock and default clocks, if the gpu clock is higher then guess what....


cant tell if trolling or just stupid
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November 27, 2011 8:02:24 PM

Im very dissapointed, if not being able to find help here, then where ?
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November 28, 2011 5:46:33 AM

Ye belive it or not i did actualy spent weeks trying to find my answere on google but couldent, if you can manage to do so then id be amazed.
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November 28, 2011 1:42:26 PM

did u do it on both cards ?
are both the cards exactly same ?
are those cards reference cards ?
are both cards getting same power ?
maybe the overclock feature is in only the reference card.
why dont u just up the clocks by yourself in msi or ccc .
is that difficult ?
btw maybe the bios switch is not for performance but for back up bios.
did u read anywhere that your cards have the oc switch ?

1)if they r oc , then keep only 1 card in 16x slot(remove the other one with the crossfire bridge interconnect)and flip switch to 1.boot up.then check the clocks.note them.
2)do the same with switch in position 2. note them.
3)repeat step 1 and 2 with second card only. if the clocks are same in all steps then maybe they dont support the oc or maybe if u have 067 board which is limiting.
4)if the clocks in both tests are same (830 in switch 1 in both cards and 880 in switch 2 in both cards), maybe the crossfire bridge could be a problem (dont know how)
try the other crossfire bridge (u get 1 bridge with 1 card)
also if there is slot for 2 bridges(idk about 6990) then use them both.
also tell your mobo.

hope this helps
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November 28, 2011 2:12:25 PM

helpy said:
did u do it on both cards ?
are both the cards exactly same ?
are those cards reference cards ?
are both cards getting same power ?
maybe the overclock feature is in only the reference card.
why dont u just up the clocks by yourself in msi or ccc .
is that difficult ?
btw maybe the bios switch is not for performance but for back up bios.
did u read anywhere that your cards have the oc switch ?

1)if they r oc , then keep only 1 card in 16x slot(remove the other one with the crossfire bridge interconnect)and flip switch to 1.boot up.then check the clocks.note them.
2)do the same with switch in position 2. note them.
3)repeat step 1 and 2 with second card only. if the clocks are same in all steps then maybe they dont support the oc or maybe if u have 067 board which is limiting.
4)if the clocks in both tests are same (830 in switch 1 in both cards and 880 in switch 2 in both cards), maybe the crossfire bridge could be a problem (dont know how)
try the other crossfire bridge (u get 1 bridge with 1 card)
also if there is slot for 2 bridges(idk about 6990) then use them both.
also tell your mobo.

hope this helps



Wil get back to you with these information by the weekend, thanks!
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!