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Biche2
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GeForce GT 555M using GF116 and possible unlock shaders? - 2011/12/15 00:32 Hi, I make a new message because it's different than the first that was just asking some help. Maybe you have seen that on the ASUS notbook series N55s the GeForce GT 555M is a bit different from those supplied by other brand like Dell as it's a GF116 ship and not GF106. The differences between these are the number of shader, being 144 versus 192, the device number, the BIOS version and the memory parameters.

As you can see in the picture on that thread (in french):
here

The GF116 which actually is also powering the GeForce GTX 560M shows that there are 4 times 48 shaders which gives a total of 192 stream processors that are available to delivere the performance. The GF116 as being used on the GeForce GT 555M is only showing 3 times 48 shaders, like one streaming multiprocessor unit was disabled. That smels like the Cayman Radeon HD 6950 unlock. Even if NVIDIA has hardware disable the shader I have enough balls to try it.

I can unlock every thing in the AMI N55s BIOS, activate every menu and enable CPU overclock, disable USB or change DDR timing, even put my name in place of all words. But I don't know how you actually extract the video BIOS. Now, if we could compare extracted BIOS from the ASUS N55s and G53 laptops maybe we could find somewhere a value 90 versus C0. Though we couldn't simply replace it because of memory type difference. So at your comment...

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Mavke
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Re:GeForce GT 555M using GF116 and possible unlock shaders? - 2011/12/15 09:27 Keep on dreaming, cause really for ages now NVIDIA has truly mastered the art of hardware locking out any shaders that a particular chip has more and that is used on a different version. The only time there was a way to unlock is the first versions of the GeForce GTX 465 and that was simply because the chips were actually GeForce GTX 470's not yet cut down at the time of release. So we had quite some lucky persons being able to flash the GeForce GTX 470 onto it and enjoy the extra shaders which were available.

As you might know the GeForce GTX 570 uses the same chipset as the GeForce GTX 580 being the 40nm GF110 but there is no way whatsoever to unlock anything as NVIDIA has really learned from the old GeForce FX series in the past which hurt their sales greatly due to the ability of unlocking pixel shaders. From that moment on they actually made it impossible to unlock through BIOS as it was the hardware that was no longer having the extra shaders. With one exception as provide above due a pushed release.

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Biche2
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Re:GeForce GT 555M using GF116 and possible unlock shaders? - 2011/12/15 12:41 Yep, I know that NVIDIA may have disabled at hardware level as I wrote before. And I know to that the GeForce GTX 570 and GeForce GTX 580 use the same chip but it was expected before the realese of the cards that there where no way to update. Now the GeForce GT5 55M, was and is a GF106 card for all notebooks exept for ASUS N55s series. The question is why ASUS has those chips and not Dell or Alienware? The hope is that I suspect NVIDIA to either sale off their stock of GeForce GTX 560M being GF116 chips and/or to enter the ASUS termal spec book with a GeForce GTX 560M.

I explain my point of view, a GeForce GT 555M using GF106 and some even the even worse GF108 are becoming the new GeForce GT 635 or GeForce GT 630 using these GF108 and/or GF106 chipset. Actually the GeForce GT 555M using the GF116 I don't know what they are becoming but they appear also to power the GeForce GT 635. But why would NVIDIA do so, meaning using this chip for several different card? So for me the stock of GeForce GTX 560M whom clearly where not has sold as lower chip, is downgraded to GeForce GT 635M.

And for commercial calendar date could had been released in ASUS notebook first as GeForce GT 555M with the probability of no hardware disable as it's the first one. The second way is the termal and consumption view, the GeForce GT 555M based on GF106 and/or GF108 are known for their important power consumption level. So emputing and underclocking the GF116 offer the same 3D calculation power than a GF106 and/or GF108 but with a lower TDP lower. for that Nvidia won't had put hardware disable , it would be too expensive for ship already cut off.

Could be the a mix of that too...

The ugly:

- Now as you said Nvidia may have work well and the GT635M could be a hardware disable of shader, and the GT555M only the pre-realised of the GT635M for testing and calendar reason.

- Could be defective SM too, that where disable to be sold

Conclusion:
Actually, what is the risk of surching some date by comparing Vbios, and even trying it?
At worst that failed , can't flash back and send sav prying
At worst that failed , i flash back and no more
It work ok but artifact: flashback
it work ok and we will make 20% (with oc) power on some laptop

For you the only risk is the loss of time,

Sorry 'im at work and few time for odering this msg.

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Mavke
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Re:GeForce GT 555M using GF116 and possible unlock shaders? - 2011/12/15 13:59 First of all, it is not ASUS that makes the decision as such which chip they can use for the GeForce GT 555M but actually NVIDIA that is setting the rules and guidelines, and approving the product. If you go around that, you have no warranty given by NVIDIA on their chips and that means not even ASUS will take that risk as that could become a very expensive adventure. Secondly the chips come from NVIDIA and will lock them down without any possibility of unlocking. Sorry we have been trying every time and we can say for sure you are dreaming.

And about the chips, if you perhaps recall the GeForce 8800 GT and the G92 chipset? How many times did NVIDIA reuse that same chip? Well more than you can imagine as that chip did power the GeForce 8800 GT, the GeForce 9800 GT and the GeForce GTS 250. This is only one example and I can give you many more. Why do they do that, to save costs but produce something new with optimized PCB and/or cooling solution but not reinventing the wheel once again.

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Biche2
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Re:GeForce GT 555M using GF116 and possible unlock shaders? - 2011/12/15 16:39 Okey!

Thanks for your advise and the time sharded with me.

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Gabe
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Re:GeForce GT 555M using GF116 and possible unlock shaders? - 2011/12/18 01:17 I also have a very, very, very fresh 550M on GF116. It overclocks past 860MHz on its 144 shaders, but becomes unstable after 735 or so because the voltage is too low.

I'd be willing to test -- if only someone could help me extract the vbios! Apparently I need to do the following:

1. Extract BIOS -- don't know how -- dell's tool says unsupported system; they only have up to A12 on their site, but for some reason I'm on A14
2. Extract vbios from extracted BIOS -- absolutely clueless on how to do this
3. Re-integrate the two (definitely have no clue)
4. Re-flash bios (maybe Dell's tool can do this part)

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