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[Official] AMD Radeon HD 6850/6870 Owners Thread - Page 309

post #3081 of 6939
Quote:
Originally Posted by TheBear View Post
Same happened to me, or I got gray screen in CoD Black Ops for example only 1125-1130Mhz max. is stable.
I'm going to test soon a new clock at 1050, at maybe more than 1.3v. lowering in the first session the memory clock at 1100. Not concerned about the temps.
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post #3082 of 6939
Can someone help me with overclocking?

I have read the main "How To: Overclock Your ATi GPU" thread and managed to get my refernce 6870 to 940 core stable. I want to know how people are getting there 6870's up to 1000core.

Cheers
post #3083 of 6939
Quote:
Originally Posted by Greg0986 View Post
Can someone help me with overclocking?

I have read the main "How To: Overclock Your ATi GPU" thread and managed to get my refernce 6870 to 940 core stable. I want to know how people are getting there 6870's up to 1000core.

Cheers
Had to adjust my voltage up to 1.3 in order to achieve 1ghz on both my 6870s. Bump up your fan speed and try to keep it under 80c @ load.
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post #3084 of 6939
How do I bump the voltage up in afterburner? It is greyed out for me. And also what is the highest safe voltage these cards can handle?
post #3085 of 6939
In order to change the voltage you have to both

A) Go to settings and check "Unlock Voltage Control" and "Unlock Voltage Monitoring"
B) Manually edit the .cfg/.ini file for both those options above to 1.

Safe voltage is determined by temperature. Find your highest stable overclock and then see if slowly bumping up the voltage helps. If in furmark it's running hotter than you'd like (for me 75C is max for 24/7) then turn it down. Raising voltage creates a lot more heat than increasing clock speed.
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post #3086 of 6939
Cheers Now I have done that, these are my current settings.

Core Clock is at 940
Memory Clock is at 1110

The voltage after I unlocked it is 1174

What voltage increments would you recommend? 5?
post #3087 of 6939
Should I increase it to 1.2v and then try and find the highest stable core clock?
post #3088 of 6939
Quote:
Originally Posted by Greg0986 View Post
Cheers Now I have done that, these are my current settings.

Core Clock is at 940
Memory Clock is at 1110

The voltage after I unlocked it is 1174

What voltage increments would you recommend? 5?
Try to overvolt starting with values between 1.23-1.27 controlling the temps (change the fan curve according to your needs) trying to stay as low as possible (max 74-82° on full load Furmark or Occt gpu tool). Don't raise the mem clock for now, try to get stable with the gpu clock first. And try a lot of various games (for more than an hour each) that will convalidate your stability.
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post #3089 of 6939
Right, I am currently at 970 core clock with fan at 40% which is keeping the temps at 65~c

Going to run Crysis maxed out in a bit for about 30 mins to see what the temps reach.

Shall I keep going?
Edited by Greg0986 - 3/6/11 at 11:39am
post #3090 of 6939
I have got 1000 core with 1.275v Now onto the memory speed
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