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How far do you think I could take a 6970M? - Page 5

post #41 of 48
Thread Starter 
Quote:
Originally Posted by RagingCain;13461541 
The GPUs from the mobile sector are designed for low voltage environments, and are not designed for overclocking.

Essentially, despite it being an iMac, its a laptop video card. They consist of heavily modded existing GPUs, I guess you found out its similar to a 6850, but the similarity ends at the GPU. The PCB is usually heavily customized and comes in one of several form factors such as MXM2.0, a/b, MXM3.0 etc.

Macs are notorious even further for making things even more locked and proprietary. So it would be tricky to over clock to start with, so without someone doing it before you, there is no frame of reference for us to give you. You are essentially on your own on this one.

I believe 10% overclock is capable on most things. The trouble is, and I assume your Mac is similar in design, it may have an integrated heatsink. A heatsink that is used with a variety of components. You started heating up this copper heatsink, and you beging to excessively heat up everything it touches. Just so you are aware. Its similar to a motherboard heatsink the touches the VRMS, the Northbridge, and the Southbridge.

You also will not have high quality power system and regulation, nor most likely, have any active or passive VRM or cooling. This increases chances of premature card death greatly.

Start looking at what laptop users are getting for safe overclocks on this card and search for dead 6970Ms, to see how they were caused.

Best of luck,

~RC

Sent from my DROID2 using Tapatalk
Thanks a lot for your reply, it was very informative.

We can overclock under Windows using MSI Afterburner (with mobile overclock enabled). This thread poster has overclocked his 2010 iMac with good results (5850M): link. If you're interested, see post #1, #9, #12, and #22. I'm hoping for similar results.

This is the 21.5" 2011 iMac motherboard:
RSV6HxRsp4PNxk6M.huge
(Link here for all the tear down photos)
I believe the top left heat-sink is for the GPU, and the middle right for the CPU. In the 27" model I believe they are just further apart.

Are they integrated? Or are they good?
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post #42 of 48
Thread Starter 
Out of curiosity, if I overclocked a 6970M to desktop 6850 speeds would it perform the same? I'm thinking it would but don't really know for sure.
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post #43 of 48
Quote:
Originally Posted by Nickzorz91;13461287 
Don't post without even reading the OP, please.
Don't try playing a mod without being one.

iMac or laptop, I don't care. They shouldn't be overclocked.

If you wanna OC, why on earth buy an iMac? Seriously..
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post #44 of 48
Thread Starter 
Quote:
Originally Posted by Stefy;13464587 
Don't try playing a mod without being one.

iMac or laptop, I don't care. They shouldn't be overclocked.

If you wanna OC, why on earth buy an iMac? Seriously..
I've got plenty of reasons why I'm buying my iMac, however, why not boost my frame rate by 10-15% if I can easily? I'm hoping to do so without increasing the temperature much.

I may not even try an overclock if the GPU is already running hot enough as I'd have to increase the fans significantly (unless it can be done so with minimal temperature increase). I think I prefer the quiet over a little higher frame rate. I'll fiddle and find out what I like.
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post #45 of 48
Not to mention the price of an iMac. I'm fairly certain those Apple techs will find you attempted to OC. Bye bye warranty.

I wouldn't do it regardless of the gains. It's also very much likely it will shorten your iMacs life considerably.
Edited by Stefy - 5/11/11 at 2:00pm
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post #46 of 48
Thread Starter 
Quote:
Originally Posted by Stefy;13466978 
Not to mention the price of an iMac. I'm fairly certain those Apple techs will find you attempted to OC. Bye bye warranty.
Tis' a worry, but they should never know. It's only a software overclock and the differences should be minor. It looks like GPU Diode can hit about 83c and the heat-sink around 80c. That's not bad (for an all-in-one) considering the fans are running silent.

If I could overclock by 10% and the temps only hit 88c for the diode, etc., I don't see the problem. And, I could double fan speed to 2000 RPM on two of them and drop the temperatures a bit.
Quote:
I wouldn't do it regardless of the gains. It's also very much likely it will shorten your iMacs life considerably.
Mmm, would it? Even a 10% OC?

What exactly is it about the overclock that shortens its life? Heat? Because I can make it run cooler with the OC if necessary.

Thanks
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post #47 of 48
Because chips like yours simply aren't designed to deal with this type of thing. It might look fine for a while and then it may blow up for all I know. It's easy to cause excessive heat in such systems that it just isn't worth the risk. You can OC your chip, but it might affect several sections of your system if you do.

I'm against it, but you seem dead set on going through with it; go ahead.
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post #48 of 48
Thread Starter 
Quote:
Originally Posted by Stefy;13470642 
Because chips like yours simply aren't designed to deal with this type of thing. It might look fine for a while and then it may blow up for all I know. It's easy to cause excessive heat in such systems that it just isn't worth the risk. You can OC your chip, but it might affect several sections of your system if you do.

I'm against it, but you seem dead set on going through with it; go ahead.
Thanks, I appreciate your input.

I'll consider it carefully, and be very careful. I'll also let others who have experience do it first. Then again, I may decide against it, I'll just have to see at the time. I might be happy with the frame rate I get, anyway.
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