Poor 6950 Performance

[notaek]

Recently, my 6950's have been performing at about 100 MHs lower than usual.  I have had no hardware changes. 

I have two of them, so that rules out having a faulty card.  I tried installing different driver versions and nothing helped.  They have plenty of power and also they never get above 70 degrees. 

Any help would be appreciated.

[Jazkal]

It would help in getting answers if you post your cgminer config/switches and versions of your OS/drivers/SDK. Without this info, any advise would be shooting in the dark.

[os2sam]

Recently, my 6950's have been performing at about 100 MHs lower than usual.

From what to what?

[notaek]

I have them overclocked to 900 MHz.  Mem downclocked to 600MHz.  Unlocked shaders.  Using -v flag, and -w 256 as well as -f 1.

I was getting 400mh/s, now I get 300mh/s.  Config hasn't changed at all.  I have had 2 7970s and 2 6950s in the system and the cards dropped in speed without any hardware configuration change.

[Pointeh]

strange, I got 300Mh from 6950 with the shaders locked or if the OC didnt hold. Has the BIOS switch on the card changed or something?

[Jazkal]

I have them overclocked to 900 MHz.  Mem downclocked to 600MHz.  Unlocked shaders.  Using -v flag, and -w 256 as well as -f 1.

I was getting 400mh/s, now I get 300mh/s.  Config hasn't changed at all.  I have had 2 7970s and 2 6950s in the system and the cards dropped in speed without any hardware configuration change.

Was the system running the the 7xxx cards before, and now is running the 6xxx cards without changing the drivers or SDK versions?

What drivers and SDK are you running them with right now?

[notaek]

I have them overclocked to 900 MHz.  Mem downclocked to 600MHz.  Unlocked shaders.  Using -v flag, and -w 256 as well as -f 1.

I was getting 400mh/s, now I get 300mh/s.  Config hasn't changed at all.  I have had 2 7970s and 2 6950s in the system and the cards dropped in speed without any hardware configuration change.

Was the system running the the 7xxx cards before, and now is running the 6xxx cards without changing the drivers or SDK versions?

What drivers and SDK are you running them with right now?

Sorry forgot to include that in previous post.  I am running 12.10 catalyst with 2.8 SDK.  I have had 2 7970s and 2 6950s for a long time.  One day, my 6950's just started running slowly.  When I reinstall the drivers I have all cards in the system.

[aa]

I have them overclocked to 900 MHz.  Mem downclocked to 600MHz.  Unlocked shaders.  Using -v flag, and -w 256 as well as -f 1.

I was getting 400mh/s, now I get 300mh/s.  Config hasn't changed at all.  I have had 2 7970s and 2 6950s in the system and the cards dropped in speed without any hardware configuration change.

What is "-f"? What did you use to drop the memory clock to 600? What are you using for vectors?

[notaek]

I figured it out.  Just needed to change drivers to 12.11 beta.