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MSI 6850 Overclocking

post #1 of 8
Thread Starter 
Hey guys, I'm about to start overclocking my 6850's to see what I can get out of them, and I see that my card has 3 types of voltage I can adjust. I was wondering, what is the maximum safe voltage for 24/7 use on these cards? Also, has anyone had any experience with overclocking one of msi's cards that have triple voltage control and do the other two voltages help with clocks at all? And is it safe to increase these voltages for 24/7 use?

Thanks!
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post #2 of 8
Good luck man, I couldn't do it. There's something about overclock a GPU that just pisses me off.
post #3 of 8
Thread Starter 
Quote:
Originally Posted by E-Peen;12600165 
Good luck man, I couldn't do it. There's something about overclock a GPU that just pisses me off.

I'm not new to overclocking gpu's at all, but i'm new to the triple voltage control.
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post #4 of 8
Going to shoot you a PM here, hope you don't mind.
post #5 of 8
Thread Starter 
Quote:
Originally Posted by E-Peen;12600195 
Going to shoot you a PM here, hope you don't mind.

Responded. smile.gif
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post #6 of 8
Bumping this thread, and since this is my 1st message here I would like to start on a good note.

I've got the Cyclone version of the MSI 6850 OC, so I don't know if my experience totally applies to the other non-Cyclone/non-OC versions of that card, but I guess it can provide some insights. Needless to say that is my experience with my current rig, so that will vary on different builds.

Things I noticed:

1 - Use MSI Afterburner Beta (latest is 2.2.0 beta 8) as it allows you to tweak the voltage. The version provided on MSI's website and CCC don't offer you this feature, and I found that it was necessary for a good OC. Saphire Trixx would lead to crashes on the first clock tweak, it doesn't seem to like this version of the card...so I'm passing it and sticking to AB beta.

2 - The core clock can take some beating. I've found a that extremely stable setting at 950 on with 1150mV. Higher clock/voltages would cause errors/monitor to stop responding - very high values would lead to a GSOD.

3 - The memory doesn't like lots of overclocking. Some reviewers managed to squeeze in a lit bit of overclocking, but none of the reviews I've seen so far provided results for long duration tests. The factory clock is already 100Mhz above the "lowest" version of the card (the XFX version), so I pushed for 1150 Mhz with 1275mV and it was 100% stable. IMO it's good enough.

4 - Bottomline: this card already comes with a nice factory overclock. My "safe OC" @ 950 on the core is 90 Mhz above the factory setting and 175 Mhz over the XFX version of the card (775Mhz). IMO those are great values, despite the shortcomings on the memory OC. My top temperatures are around 64c on full-load with OC, which is 8c higher than the factory settings under those circunstances.

Most of all, great performance. Playing Crysis2 with solid 60 fps on extreme settings with some AA tweaks, DX11, HR textures @ 1440x900. Very happy camper here. smile.gif

Cheers!
Edited by diogo_cme - 10/19/11 at 8:04am
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post #7 of 8
I managed to get my MSI with core voltage on 1289mV the core clock on 1035Mhz!!! (even higher but resulted in artifacts)
On passmark 11 I got 4692 points so mine is as good as a almost double expensive other cards aight

(useless post)
    
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post #8 of 8
Quote:
Originally Posted by Smithingya;15357634 
I managed to get my MSI with core voltage on 1289mV the core clock on 1035Mhz!!! (even higher but resulted in artifacts)
On passmark 11 I got 4692 points so mine is as good as a almost double expensive other cards aight

(useless post)

Did you try error-checking it with OCCT?

I've changed my "booster" OC to 950/1150 @ 1275mV after doing some benchmark with error-checking. If I push any further, OCCT will give me errors...doesn't matter if I tweak the voltages, errors occured at higher clocks.

Also, the GPU temperature on the OCCT test will go up to 82c - which is a lot to me. Under heavy (Crysis2) gaming, it wont pass 65c so I'm sticking to those values.
Edited by diogo_cme - 10/19/11 at 8:05am
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