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How far do you think I could take a 6970M?

post #1 of 48
Thread Starter 
Hey,

According to what I've read the 6970M is just an underclocked desktop 6850. It's got a core clock speed of 680MHz while the 6850 has 775MHz.
How far do you think it could be pushed? I'm expecting to be able to get it up to the desktop speeds, but is any further possible?

Would I be right in thinking that the 6970M is identical to the 6850 desktop aside from the clock speed difference. I.e, just as capable for overclocking, not limited in anyway, etc.

(This will be in a 27" iMac not a laptop, so sufficient cooling will be available to a certain point.)
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post #2 of 48
I don't believe AMD drivers will allow you to OC a mobile GPU. They didn't with the 4670 in my laptop anyways.

Either way, based on the lack of cooling and probable lack of high end components in the VRM department and around there, I wouldn't OC it at all.
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post #3 of 48
Thread Starter 
Thanks for your reply,
Quote:
Originally Posted by SgtHop;13435942 
I don't believe AMD drivers will allow you to OC a mobile GPU. They didn't with the 4670 in my laptop anyways.
Yeah, they will. MSI Afterburner works if you enable it for mobile GPUs. IIRC the 4850M has been successfully overclocked, and very much more so for the 5850M in the high end 27" 2010 iMac.
Quote:
Either way, based on the lack of cooling and probable lack of high end components in the VRM department and around there, I wouldn't OC it at all.
The cooling should be fine. However, what do you mean lack of high end components in the VRM department?
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post #4 of 48
Maybe so, I wouldn't OC a mobile GPU anyways, I was just curious. I know you can't in Catalyst.

And, I mean, generally desktop cards are built with a beefy VRM designed to handle the extra stress of overclocking. I doubt that a mobile chip is going to have that feature, because it's not made to be overclocked.
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post #5 of 48
I got my 5870m (basically underclocked 5770) in the asus I had up to 880/1220 at one point

But it was sitting on top of an ac unit tongue.gif

You should be able to coax 6850 clocks out of it I would imagine, they underclock them mainly due to heat and power draw consideration
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post #6 of 48
Afterburner?
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post #7 of 48
Thread Starter 
Quote:
Originally Posted by SgtHop;13436149 
Maybe so, I wouldn't OC a mobile GPU anyways, I was just curious. I know you can't in Catalyst.
Ah, yeah, I see.
Quote:
And, I mean, generally desktop cards are built with a beefy VRM designed to handle the extra stress of overclocking. I doubt that a mobile chip is going to have that feature, because it's not made to be overclocked.
I see, so the 6970M despite being the same as an underclocked desktop 6850 is designed a little different? Uhh, what is a VRM btw?
Quote:
Originally Posted by trulsrohk;13436180 
I got my 5870m (basically underclocked 5770) in the asus I had up to 880/1220 at one point

But it was sitting on top of an ac unit tongue.gif

You should be able to coax 6850 clocks out of it I would imagine, they underclock them mainly due to heat and power draw consideration
Heh, that's pretty good.

In another forum, a member did a GPU stress test with his 5850M in his iMac at stock clocks (618 core, 1000 memory) and scored 21/58/38 FPS (min/max/avg) and hit 70.5c. With 750/1075 clocks, the score was 30/67/44 and only hit 74c. (Fans were at 1800/1800/1600 over stock 1000/1000/1000.)

I'm hoping for similar results, good performance increase with low temperature increase. I should be able to play Crysis 2 on 'High' at 2560x1440 with 40+ FPS if I can take the clock speed a little higher than the desktop card.
Edited by steelbom - 5/8/11 at 9:10pm
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post #8 of 48
Voltage Regulation Module. It's the thing that keeps the voltage going to the CPU in check. The more you push the GPU though, the more wattage has to pass through these regulators, which increases the stress on them, in turn causing them to heat up.
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post #9 of 48
Thread Starter 
Quote:
Originally Posted by SgtHop;13436413 
Voltage Regulation Module. It's the thing that keeps the voltage going to the CPU in check. The more you push the GPU though, the more wattage has to pass through these regulators, which increases the stress on them, in turn causing them to heat up.
Ah, I see. Thanks, it'll be interesting to see how the 6970M fairs.

Does VRAM size affect overclocking? i.e, easier to overclock 6970M 1GB vs 2GB?
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post #10 of 48
1GB vs 2GB has little effect. the 2GB model might use a little more power and create
a little more heat.
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