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MSI Twin Frozr III 6950 OC Tips

post #1 of 24
Thread Starter 
I've just purchased and installed a TF3 PE/OC and have OC'd it to 880/1350 with no issues in Furmark aside from somewhat high temps...

I have unlocked the shaders to 1536, which (from what I can discern from the deeply contradictory information I've found online thus far) gets the same performance with a slightly lower Core Clock(?)

As I said, I've run Furmark for 5 minutes and haven't seen any artifacts at 880/1350, but Furmark also reports my VCore @ 1.150V despite having upped the VCore in AfterBurner to 1.250V (+10mV in VAux)

Would anyone have tips for what I should be striving for? I tried upping the clock to 950/1475 just for fun - it crashed pretty quickly tongue.gif

Cheers!
Edited by PFiddles - 11/7/11 at 5:15am
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post #2 of 24
Yeah, i actually have similar problems (though i cant unlock shaders) i can increase clocks, but only to 900Mhz, thats with original bios.
When i flash modified MSI bios (to unlock shaders) i can increase GPU beyond 900Mhz, but voltage control no longer works. Any idea what to do?
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post #3 of 24
Ok PissFiddles, you need to edit MSIafterburner.cfg
Do a search for

UnofficialOverclockingEULA=
UnofficialOverclockingMode= 0

and change it to

UnofficialOverclockingEULA= I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
UnofficialOverclockingMode= 1

If it still didnt work, change in MSI Afterburner - General - Graphics Processor type to 1150mV or 1100mV.
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post #4 of 24
Thread Starter 
I tried changing those values in the .cfg file, but Furmark still recognises it as 1.150V

It was set to 1.100V in the settings in Afterburner, but changing that value had no effect on the value in Furmark either...
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post #5 of 24
Quote:
Originally Posted by PissFiddles;15603578 
I tried changing those values in the .cfg file, but Furmark still recognises it as 1.150V

It was set to 1.100V in the settings in Afterburner, but changing that value had no effect on the value in Furmark either...

Select 1.150v in Afterburner then click "apply".

Increase the voltage in Afterburner and "apply. If you are getting artifacts/crash, lower the core/memory OC clocks. The chips are hitting the wall and might not have a high tolerance of backward leakage currents.

First lower the memory clock to avoid ECC to kick in. Higher memory clocks such as at 1550 if, it allows you to go that high, will outweigh the ECC.
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post #6 of 24
Thread Starter 
Thanks heaps Ken, +rep smile.gif

So I've set;

-VCore @ 1.25v
-Core Clock @ 910MHz
-Memory Clock @1400MHz

Several minutes in Furmark has yielded no artifacting, but the temps reached 89°C... What would be the best way to drop temps? Drop the VCore?
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post #7 of 24
The combinations of increasing fan speed, lower Vcore, core/memory clocks. The memory doesn't have temperature sensor, so might watch it there though no sign of artifacts.

Furmark 80c is nothing unusual for several minutes just for testing the OC settings, but I wouldn't go beyond 70c for daily gaming.

If 89c on the core, the Vreg temperature might get to a scary zone.
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post #8 of 24
Thread Starter 
Fan speed was up around 4500RPM @ 100% redface.gif
I might perhaps drop the clocks by 10MHz and 25MHz respectively... would that have much bearing on the temps, do you think?

Should I just leave it at 900/1375 @ 1536shaders for now and see how that goes for gaming if it's not artifacting in Furmark?

Cheers smile.gif
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post #9 of 24
Quote:
Originally Posted by PissFiddles;15609388 
Thanks heaps Ken, +rep smile.gif

So I've set;

-VCore @ 1.25v
-Core Clock @ 910MHz
-Memory Clock @1400MHz

Several minutes in Furmark has yielded no artifacting, but the temps reached 89°C... What would be the best way to drop temps? Drop the VCore?

why do you want to OC memory clock? this only put more stress on the card and hardly much improvement to performance, use default setting, crank of the fan, 89C is very high for 910mhz... I think you can lowered your vcore for 910mhz

- just saw your latest post @100% fan... do what you have to do, 89C is very high
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post #10 of 24
Thread Starter 
Okay, I dropped the Memory clock back to default, keeping the core @ 920 (where it hit 89°C last time)

1.24V
920/1300

Let's see what Furmark gets us this time!

EDIT:
Dropping the Core clock back to 910, artifacted in Furmark

EDIT2:
I was out of the room for a few minutes while Furmark was running just now, but the temp stayed pretty stable at 85°C... A bit better at least tongue.gif
Edited by PFiddles - 11/7/11 at 4:22pm
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