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Pixel Fill rate on 580 seems very very low - Page 2

post #11 of 18
http://www.techpowerup.com/gpuz/v8m2x/

My submission i did for the 480 with a 950mhz core clock, this was the latest at time of validation, and read the throughput wrong, the 480 at that clock is over 50 GPixel/s.
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post #12 of 18
Quote:
Originally Posted by epinephelus View Post

Ok mate. If you say so it must be true wink.gif

"The pixel fillrate in GPU-Z is displayed wrong for Nvidia Fermi based graphics cards. The pixel fillrate seems to be calculated by multiplying the number of ROPs and the GPU clock. But in case of Fermi gpus the pixel fillrate is generally not limited by the number of ROPs but by the number of streaming multiprocessors. Each streaming multiprocessor is capable of processing two pixels per clock. So if there are 16 SMs and 48 ROPs like in the GeForce GTX 580, the SMs limit the pixel fillrate. This is the case for all Fermi based graphics cards i know."

http://www.techpowerup.com/forums/threads/pixel-fillrate-and-fermi.155459/
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post #13 of 18
Quote:
Originally Posted by amd655 View Post

"The pixel fillrate in GPU-Z is displayed wrong for Nvidia Fermi based graphics cards. The pixel fillrate seems to be calculated by multiplying the number of ROPs and the GPU clock. But in case of Fermi gpus the pixel fillrate is generally not limited by the number of ROPs but by the number of streaming multiprocessors. Each streaming multiprocessor is capable of processing two pixels per clock. So if there are 16 SMs and 48 ROPs like in the GeForce GTX 580, the SMs limit the pixel fillrate. This is the case for all Fermi based graphics cards i know."

http://www.techpowerup.com/forums/threads/pixel-fillrate-and-fermi.155459/

LOL!!!! You just proved my point. GPU-z fixed this bug but not ROG GPU-z. Read what you posted and my posts again smile.gif
Edited by epinephelus - 1/10/14 at 2:35pm
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post #14 of 18
Quote:
Originally Posted by epinephelus View Post

LOL!!!! You just proved my point. GPU-z corrected this bug but not ROG GPU-z. Read what you posted and my posts again smile.gif
Read what is in the link, not just the tid bit i quoted.
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post #15 of 18
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post #16 of 18
Quote:
Originally Posted by amd655 View Post

Read what is in the link, not just the tid bit i quoted.
I read it. Says exactly what I am saying
Quote:
Originally Posted by amd655 View Post

http://de.wikipedia.org/wiki/Nvidia-Geforce-400-Serie#Leistungsdaten

These are the correct (stock) fillrates.

Again german wikipedia which you brought to the play agrees with me (not that Is a source): http://de.wikipedia.org/wiki/Nvidia-Geforce-500-Serie#Leistungsdaten

If you read my first post on this thread I explain what ROG and what GPUz report and why the later is closer to the real one (which is even smaller).
With which part do you disagree?
That the pixels are only going to the ROPs after being processed from SMs?
That SM's process two pixels each clock cycle?
anyway because I am tired of going over the same stuff again this guy here says it and references it well; have a read:
http://en.wikipedia.org/wiki/Talk%3AComparison_of_Nvidia_graphics_processing_units#Calculating_Pixel_Fillrate_on_Fermi-based_Cards
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post #17 of 18
Eh? you will have to excuse me, i am a bit jumbled up when i'm tired, ignore what i typed, i must have been confusing something in my own links lol.
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post #18 of 18
Thread Starter 
Quote:
Originally Posted by amd655 View Post

http://de.wikipedia.org/wiki/Nvidia-Geforce-400-Serie#Leistungsdaten

These are the correct (stock) fillrates.

then if wikipedia is right (rarely) this the 580 is in fact 37.1 http://en.wikipedia.org/wiki/GeForce_500_Series#Chipset_table
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