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How far do you think I could take a 6970M? - Page 4

post #31 of 48
It has how many fans? That OC WILL be unstable, theres no 2 ways about it. You can't just OC a card to 1ghz and assume its all fine a sundry.

I dare you to run Furmark.
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post #32 of 48
Quote:
Originally Posted by Jesse^_^ View Post
It has how many fans? 618 to 1ghz is a very large jump and will result in more than 4c Temps higher.
It was 618 to 750. 1000MHz is the stock memory clock.
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post #33 of 48
Quote:
Originally Posted by SgtHop View Post
It was 618 to 750. 1000MHz is the stock memory clock.
Sorry, I coudn't see a comma. My bad >.>
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post #34 of 48
Thread Starter 
Quote:
Originally Posted by Jesse^_^ View Post
It has how many fans? That OC WILL be unstable, theres no 2 ways about it. You can't just OC a card to 1ghz and assume its all fine a sundry.

I dare you to run Furmark.
Aha, I see you realised that below but that made me laugh. Haha, my iMac would melt with the GPU at 1GHz. It has three fans btw, for the record. The PSU also wouldn't have enough power.
Quote:
Originally Posted by SgtHop View Post
It was 618 to 750. 1000MHz is the stock memory clock.
That's correct.
Quote:
Originally Posted by Jesse^_^ View Post
Sorry, I coudn't see a comma. My bad >.>
Maybe I didn't write it very clearly, I said: "618 core and 1000 memory to 750 core and 1075 memory". Perhaps next time I will use a comma instead of an "and".
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post #35 of 48
Quote:
Originally Posted by steelbom View Post
Aha, I see you realised that below but that made me laugh. Haha, my iMac would melt with the GPU at 1GHz. It has three fans btw, for the record. The PSU also wouldn't have enough power.

That's correct.

Maybe I didn't write it very clearly, I said: "618 core and 1000 memory to 750 core and 1075 memory". Perhaps next time I will use a comma instead of an "and".
Even in the desktop imac, i would not overclock it at all.
The cooling in there is not great either.
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post #36 of 48
The 6970m in my Sager is 680core and 900memory stock. CCC will only let me go up to 710core but the memory seems to be able to go up to 1000. I've only gone as high as 920 or 925 I think.
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post #37 of 48
Don't overclock a laptop, please.
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post #38 of 48
Thread Starter 
Quote:
Originally Posted by L36 View Post
Even in the desktop imac, i would not overclock it at all.
The cooling in there is not great either.
I know, it's been done before in the 2010 model with the 5850 mobility. It went from ~600 core, 1000 memory to 750 core, 1075 memory with only a 4c temperature increase. FPS improvement was about 15%. That's pretty good results, and I'm hoping for that.
Quote:
Originally Posted by xBlitzerx View Post
The 6970m in my Sager is 680core and 900memory stock. CCC will only let me go up to 710core but the memory seems to be able to go up to 1000. I've only gone as high as 920 or 925 I think.
Hey thanks man, good to know.
Quote:
Originally Posted by Stefy View Post
Don't overclock a laptop, please.
Not a laptop
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post #39 of 48
Quote:
Originally Posted by Stefy View Post
Don't overclock a laptop, please.
Don't post without even reading the OP, please.
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post #40 of 48
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
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