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Overclocking the GTX 680m (M17x R4) and some other details...

n13L5

Member
Joined
Jul 12, 2012
Messages
45
Nvidia's GeForce GTX 680m is a lower clocked version of the desktop Geforce GTX 670. The specs say its core clock is 720 MHz.

Alienware delivers it already overclocked to 758 MHz core clock speed and 1800 MHz memory clock speed, delivering 6130 points in 3DMark 11.

Using EVGA's Precision X utility along with the Precision X Android app, allowing me to monitor clock speeds and temperature conveniently from my phone, I set out to see how much room there was left. This was mainly prompted by the game "The Secret World" not running with quite as many fps I would have liked with all settings on Ultra in 1080p resolution and Stereoscopic 3D Vision 2 enabled. Frame rate was hovering between 20 and 30 fps, and I would have preferred it between 30 and 40 fps without having to lower any settings.

Nvidia's rated clock speed:
720 MHz / 1800 MHz . . . . . . . 5924 Points 3DMark 11

Alienware's oc clock speed:
758 MHz / 1800 MHz . . . . . . . 6130 Points 3DMark 11

Overclocked a little further:
806 MHz / 1920 MHz . . . . . . . 6475 Points 3DMark 11

OC'ed as far as it would go:
864 MHz / 2066 MHz . . . . . . . 6813 Points 3DMark 11

Anything beyond 864 MHz ended up getting throttled, causing scores to drop ~100-200 points below the 864 MHz score. Keeping the memory at 2.5x core speed also ended up reducing the score - dropping to 2.4x gave me the best result. This cap on overclocking could be caused by the fact that adjusting the power target is disabled on the Alienware Laptop, and the card gets starved for power beyond a certain point. Else, that might just be the top for my particular chip - they all turn out slightly different, some may do better, some worse. I presume all GTX 680m are made up of GTX 670 desktop chips that didn't run stable at the desktop card's intended speed, and went into a lower bin. Given the yield problems Nvidia had, they probably have a ton of those laying around.

Besides, I was pretty happy about a 13% performance increase from stock.

Sadly, this didn't change my in-game frame rate one bit and it looks like I'll have to back off from 'Ultra' settings in 3D Vision mode.


This results in a recommendation: If you don't get the GTX 680, don't even bother with the expensive 3D option. The GTX 675 is so much worse at 3260 Points in 3DMark 11, it would be a complete waste of time to try any recent game in 3D Vision with that. And since the 675 is a re-branded Fermi chip, it runs hot too, having the same TDP as the GTX 680 that has more than double the performance.
 
Last edited:

daddyz

Member
Joined
Feb 10, 2012
Messages
6
Nvidia's GeForce GTX 680m is a lower clocked version of the desktop Geforce GTX 670. The specs say its core clock is 720 MHz.

Alienware delivers it already overclocked to 758 MHz core clock speed and 1800 MHz memory clock speed, delivering 6130 points in 3DMark 11.

Using EVGA's Precision X utility along with the Precision X Android app, allowing me to monitor clock speeds and temperature conveniently from my phone, I set out to see how much room there was left. This was mainly prompted by the game "The Secret World" not running with quite as many fps I would have liked with all settings on Ultra in 1080p resolution and Stereoscopic 3D Vision 2 enabled. Frame rate was hovering between 20 and 30 fps, and I would have preferred it between 30 and 40 fps without having to lower any settings.

Nvidia's rated clock speed:
720 MHz / 1800 MHz . . . . . . . 5924 Points 3DMark 11

Alienware's oc clock speed:
758 MHz / 1800 MHz . . . . . . . 6130 Points 3DMark 11

Overclocked a little further:
806 MHz / 1920 MHz . . . . . . . 6475 Points 3DMark 11

OC'ed as far as it would go:
864 MHz / 2066 MHz . . . . . . . 6813 Points 3DMark 11

Anything beyond 864 MHz ended up getting throttled, causing scores to drop ~100-200 points below the 864 MHz score. Keeping the memory at 2.5x core speed also ended up reducing the score - dropping to 2.4x gave me the best result. This cap on overclocking could be caused by the fact that adjusting the power target is disabled on the Alienware Laptop, and the card gets starved for power beyond a certain point. Else, that might just be the top for my particular chip - they all turn out slightly different, some may do better, some worse. I presume all GTX 680m are made up of GTX 670 desktop chips that didn't run stable at the desktop card's intended speed, and went into a lower bin. Given the yield problems Nvidia had, they probably have a ton of those laying around.

Besides, I was pretty happy about a 13% performance increase from stock.

Sadly, this didn't change my in-game frame rate one bit and it looks like I'll have to back off from 'Ultra' settings in 3D Vision mode.


This results in a recommendation: If you don't get the GTX 680, don't even bother with the expensive 3D option. The GTX 675 is so much worse at 3260 Points in 3DMark 11, it would be a complete waste of time to try any recent game in 3D Vision with that. And since the 675 is a re-branded Fermi chip, it runs hot too, having the same TDP as the GTX 680 that has more than double the performance.



Hi,

What sw you used to OC this 680m?


rgds
 
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