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Overclocking Ram 6850 BSOD

post #1 of 7
Thread Starter 
Hey,
I Decided yesterday to start overclocking my 6850 CF.
I managed to get to 930 core mhz without any artifacts so I kept it there.
The moment I started overclocking the memory mhz I started getting BSOD's.
It started when I got to 1050 mhz and since than it is very unstable.
Each time I restart my computer I have a 50% of getting BSOD on startup.

Since I did a system restore I stopped getting BSOD.
My question is, is 1050 mhz my limit ? Is there a reason why Im getting BSOD ? Does overclocking core to 930 (from 775 mhz) and memory to 1040 (from 1000) be felt at all ?

Really appreciate your comments,
Thanks alot.
post #2 of 7
I'm not familiar with OC'ing non-NVidia cards, but I'll try to help anyway. Have you increased the voltage any? Here, this link may help you out.

http://www.anandtech.com/show/4002/a...asus-xfx-msi/1

Especially the pages titled "Pushing the Overclock Limits" and "Overclocking Performance".

EDIT - forgot to add another helpful link
http://www.overclock.net/amd-ati/917...ng-review.html

From our very own Sinn98 - it's a pretty nice write up with some useful information in there and TONS of pretty pictures to look at.
Edited by Razinhail - 10/23/11 at 10:59pm
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Big Baby
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post #3 of 7
Quote:
Originally Posted by MichaelEngstler View Post
Hey,
I Decided yesterday to start overclocking my 6850 CF.
I managed to get to 930 core mhz without any artifacts so I kept it there.
The moment I started overclocking the memory mhz I started getting BSOD's.
It started when I got to 1050 mhz and since than it is very unstable.
Each time I restart my computer I have a 50% of getting BSOD on startup.

Since I did a system restore I stopped getting BSOD.
My question is, is 1050 mhz my limit ? Is there a reason why Im getting BSOD ? Does overclocking core to 930 (from 775 mhz) and memory to 1040 (from 1000) be felt at all ?

Really appreciate your comments,
Thanks alot.
What are you using to overclock 6850 crossfire?

Please fill this http://www.overclock.net/specs.php?do=addsystem
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Razinhail View Post
I'm not familiar with OC'ing non-NVidia cards, but I'll try to help anyway. Have you increased the voltage any? Here, this link may help you out.

http://www.anandtech.com/show/4002/a...asus-xfx-msi/1

Especially the pages titled "Pushing the Overclock Limits" and "Overclocking Performance".

EDIT - forgot to add another helpful link
http://www.overclock.net/amd-ati/917...ng-review.html

From our very own Sinn98 - it's a pretty nice write up with some useful information in there and TONS of pretty pictures to look at.
Thanks alot I will read all of your links and see if they are helpfull.
Anyway, while testing the limit of my memory overclock, could I make permanent damage ? (These blue screens tend to scare me )
post #5 of 7
Thread Starter 
Quote:
Originally Posted by Ken1649 View Post
What are you using to overclock 6850 crossfire?

Please fill this http://www.overclock.net/specs.php?do=addsystem
Thanks alot for your reply I will fill the form you gave me.
Im using MSI afterburner.
I changed the .cnf file and registry file as required .. But still after 1050 mhz BAM I get blue screens.

I Would like to add another interesting face, I tend to get the blue screens during startup (50% yes 50% no), and If I didnt get it during startup I usually could do anything without getting errors (Even make intense tests using GPUTool and prime).
Isnt that weird ? Why do the blue screen tend to get only during startup ?
post #6 of 7
Quote:
Originally Posted by MichaelEngstler View Post
Thanks alot for your reply I will fill the form you gave me.
Im using MSI afterburner.
I changed the .cnf file and registry file as required .. But still after 1050 mhz BAM I get blue screens.

I Would like to add another interesting face, I tend to get the blue screens during startup (50% yes 50% no), and If I didnt get it during startup I usually could do anything without getting errors (Even make intense tests using GPUTool and prime).
Isnt that weird ? Why do the blue screen tend to get only during startup ?
Since you are using Afterburner, these are the things for you to try:

1. Remove Afterburner, select "no" when prompted to keep settings.

2. Install Catalyst 11.9 + CAP3 <---- This is important for crossfire. Download link http://sites.amd.com/us/game/downloa...n_win7-64.aspx

3. Download and install Afterburner 2.2.0 Beta 8

4. Disable ULPS:
- Go to regedit (start > search programs and files > "regedit").
- In drop down menu: find file > type "enableulps".
- For ALL instances (keep pressing F3) change the "1" value to a "0".
- Reboot PC.
- Force constant voltage in Afterburner

See how it works out.
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post #7 of 7
Just as a note to you, you'll get more advantage in overclocking the core versus the memory. So if you are unstable at even 1050, I would suggest leaving it at 1000. My card too (although a Sapphire 6850 and not CF) won't overclock the memory well at all.

Beyond that, the BSOD's sound like it's not just a video card thing if it's going on during startup. I would suggest dropping any overclocks you may have on the system and start fresh.
    
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