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Worried about overclocking 6950 Memory Clock

post #1 of 20
Thread Starter 
Hello all.

I'm new to the entire custom building PC scene but after a few months I've managed to compose a list of parts, order them, put them together, and now here I am today, for the first day, on my new built PC.

However, I have a question.

I ordered a Sapphire 6950 2GB Dirt3 Edition which did successfully have the 6970 shaders.

Following the many guides on these forums, I have (what I construe to be a successful) overclock of the Core Clock.

I have currently reached 930mhz as my core clock, and although I understand that that is pretty low for my card, there isn't really much I can do.

But here is my question: I am overclocking my Memory Clock but I see no signs of instability. I have currently reached 1440mhz but I refuse to go any further without the go-ahead from this community.

I'm not sure what is a safe Memory Clock but for some reason my card is going strong at 1440mhz, reaching only ~68°C-70°C.

Should I continue to overclock? I've been going in 20mhz increments.

EDIT: I've been using coffeejunky's guide, if that helps at all.
Edited by Dreadnought - 11/3/11 at 8:23pm
The Dreadnought
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The Dreadnought
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post #2 of 20
930 is a reasonable core clock, and 1440 is good also. You wont find any real improvements going past 1450 ish generally anyway, so dont push it further than you need to if it doesnt actually help. Just watch your voltages, and if temps stay cool then your good to go!

And dont worry about stress testing your card with furmark, benchmarks etc. you need a game to really check for stability of an overclock.
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post #3 of 20
Thread Starter 
Really? I thought 930 was pretty low for an unlocked 6950.

I've heard/seen of people getting ~1150mhz. I guess I just took what the experts/pro's got as "the average."

As for my Memory Clock, should I just leave it as 1440mhz then?

Also, I haven't touched my voltage because I'm scared of damaging my card (also since it's greyed out on MSI After Burner).
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post #4 of 20
Ok, those kind of clocks are for people running high voltages generally with water cooling, and probably for benchmarking only. I would consider anything 920 and up on stock cooler, that is stable for games like bc2/bf3 and runs at that clock everyday, to be a good clock. Yes you can get up close to 1000 in some instances, but this isnt the norm.

You should run some type of benchmark and be comparing your scores between each clock, this way you can tell what improvements you are getting. If its not improving, then no point clocking further. But you could leave it at 1440 and this should be ok.

You will need at least some voltage to run at those clocks, more than likely. If you run those clocks on stock voltage, and it gets through some games, you could in fact have a very good card. It means a slight bump in voltage would give you even more core clock. But, run some kind of benchmark, test for improvements, then if you are happy with where you are, play a game to test for stability. If it crashes, you can up the voltage a bit, try again. My recommendation is dont go over 1.2V on air, so you have about 100mv to play with. I like to keep mine under 1175, but others push a bit over 2. It just comes down to temperature and what you are happy with.

From my experience, at 920/1440 you will need some extra voltage past stock, but it wont need much. 1115mv in afterburner would probably take care of it. You will need to google on how to unlock voltages in afterburner, it requires selecting a tickbox in options and also editing a text file.
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post #5 of 20
Thread Starter 
Well, I am definitely running on stock voltage and I've decided to just settle on 930/1150.

If I run into any problems while gaming I'll drop each by ~5mhz (would that be effective?).
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post #6 of 20
Dw so much about memory OC. Set it to 1400 and leave it. Go back to your core clock and work on that. Try to get it to 950, that should be easy for your card. Max voltage is 1.3v, but not a god idea to run it at those volts for more than a few benches or tests. A safe voltage would be <1.2v.

So bump up the volts a bit (.2v increments maybe) and see what you can get on the core. Also make sure your card stays cool (under 85C preferred)
post #7 of 20
Quote:
Originally Posted by Dreadnought View Post
Well, I am definitely running on stock voltage and I've decided to just settle on 930/1150.

If I run into any problems while gaming I'll drop each by ~5mhz (would that be effective?).
Yes but is it stable? Run some games and see how it goes. Dont put the voltage up to 1150 unless you need it, if it runs at stock voltage at 930 you are golden. Push for a little more clock again, and then when it starts crashing, then up your voltage, and clock some more.
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post #8 of 20
Thread Starter 
Quote:
Originally Posted by hirolla888 View Post
Dw so much about memory OC. Set it to 1400 and leave it. Go back to your core clock and work on that. Try to get it to 950, that should be easy for your card. Max voltage is 1.3v, but not a god idea to run it at those volts for more than a few benches or tests. A safe voltage would be <1.2v.

So bump up the volts a bit (.2v increments maybe) and see what you can get on the core. Also make sure your card stays cool (under 85C preferred)
Well 950 was where I started to get artifacts. And they were everywhere and nonstop.

I tried 940 but after a minute or so I started getting a few artifacts.

I dropped to 930 and did ~20 minutes and no artifacts and my temperature was a solid 66°.


Quote:
Originally Posted by whippy View Post
Yes but is it stable? Run some games and see how it goes. Dont put the voltage up to 1150 unless you need it, if it runs at stock voltage at 930 you are golden. Push for a little more clock again, and then when it starts crashing, then up your voltage, and clock some more.
Sorry, I should have phrased that better.

I meant to say that I'll keep it on the settings I have right now and try to run some games. If the games show instability then I'll definitely have to re-adjust.

(Also, how do I increase my voltage if MSI After Burner won't let me?)
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post #9 of 20
Sounds good.

Theres an option in settings you need to turn on, and there is also a text file in the Afterburner folder you need to add a line to. Google afterburner voltage eula and should come up.
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post #10 of 20
Thread Starter 
I edited the .cfg file and added the necessary lines, and I went into settings and allowed the voltage to be altered but it's still greyed out.

Also, my game crashed, which is what made me go into afterburner anyways.
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The Dreadnought
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