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[Vr-Zone] NVIDIA's shady trick to boost the GeForce 9600GT

post #1 of 11
Thread Starter 
Quote:
How NVIDIA made the 9600 GT gain extra performance .. secretly
When we first reviewed NVIDIA's new GeForce 9600 GT (review here), we noticed a discrepancy between the core clock speed reported by the driver and the core clock speed read from the clock generator directly.



RivaTuner Overclocking and GPU-Z read the clocks from the NVIDIA driver, displaying whatever the driver returns as core clock. Rivatuner Monitoring however accesses the clock generator inside the GPU directly and gets its information from there. A PLL to generate clocks works as follows. It is fed a base frequency from a crystal oscillator, typically in the 13..27 MHz range. It then multiplies and divides this frequency by an integer value to reach the final clock speed. For example 630 MHz = 27 MHz * 70 / 3.

The information which crystal is used is stored inside the GPU's strap registers which are initialized from a resistor configuration on the PCB and the VGA BIOS. In case of the GeForce 9600 GT the strap says "27 MHz" crystal frequency and Rivatuner Monitoring applies that to its clock reading code, resulting frequency: 783 MHz = 27 MHz * 29 / 1. The NVIDIA driver however uses 25 MHz for its calculation: 725 MHz = 25 * 29 / 1.

This explains the clock difference and can only be seen on the core frequency (the memory PLL is always running at 27 MHz).

We verified this personally on three 9600 GT cards from various manufacturers, other users confirm this too.

Now the big question is, what is going on here? When I asked NVIDIA about this phenomenon they replied:
The crystal frequency is 25MHz on 9600GT. Clock is 650MHz.
No further details were given. I also sent another email later asking for an update on this - no reply.
Good read and interesting.

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post #2 of 11
Hold on, that's just clock straps...that some apps don't pick up. How is that an Nvidia conspiracy? lol
 
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post #3 of 11
Sounds interesting, but it sounds like it could just be Rivatuner and GPU-z's being out of date.

I wonder how overclocking would change this.

Darn you Nvidia I hate it when you overclock it for me! Taking my fun...
    
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post #4 of 11
My 8800GTS also does that
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post #5 of 11
Yeah, I think this is just a simple software bug, not some trickery by Nvidia. Someone thinks they are real clever, when in reality they aren't.
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post #6 of 11
thats what i was gonna say, its a gpu-z error. im saying this becuase on peak load it says my card temp is like 36 when everest reports around 50.
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post #7 of 11
Im failing to see how this is "shady" unless im missing the joke somewhere. If so forgive me my sense of humor has run dry of late. A question or two if I may? What if this isn't a glitch or software error? What if this is truth and its not being made a big deal because its relating to the big deal to be made with CUDA? Im not an expert im just honestly curious as it would seem to me that it would be advantageous to oc the port and the card when running the amount of parallel code these things are supposed to do? Wouldn't this make it easier for say like FAH to use CUDA to oc the card and the port for crunching numbers through it? Im making the assumption that this is related to this posting as well forgive me if im wrong.

http://www.overclock.net/hardware-ne...t-exposed.html
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post #8 of 11
How did I miss this?
I reposted this
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by grunion View Post
How did I miss this?
I reposted this
I saw that you reposted, but I never tell the OP because i know how annoying it can be when the first 10 post just says "REPOST!".

No problem mate.
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post #10 of 11
That's not a clock strap! Clock straps don't differ by 50+ mhz! An example being on my card when I put in 900, it's actual clock is 891.
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