How to calculate GDDR6 speed from GPU-Z?

[AntDeek]

So apparently my new RTX 2070 has 14000MHZ on the GDDR6, however GPU-Z reads at around 2000. I remember with GDDR5 you just multiply that by 4 since it's "quad pumped", but how do I calculate the GDDR6 speed?

 

[EarthDog]

The same way.


Your card is 1750 MHz at stock IIRC. Its DOUBLE DATA RATE and Quad pumped. Just how you would have done this with GDDR5. 2x the value, then 4x.

 

[eidairaman1]

The same way.


Your card is 1750 MHz at stock IIRC. Its DOUBLE DATA RATE and Quad pumped. Just how you would have done this with GDDR5. 2x the value, then 4x.

Yeah i dont thing gddr6 is octal pumped as gddr5 was quad pumped

 

[newtekie1]

GDDR5X and GDDR6 are both 8x the actual clock.

So GPU-Z will report 1,750MHz, which is the actual clock speed of the VRAM. You multiply that by 8 to get 14,000MHz effective clock speed.

Its DOUBLE DATA RATE and Quad pumped. Just how you would have done this with GDDR5. 2x the value, then 4x.

That isn't what double data rate means, well sort of. Double data rate, or DDR, means you multiply the actual clock by 2. Really GDDR5 should have been called QDR not DDR, as it was no longer Double Data Rate, it was Quad Data Rate. GDDR5X and GDDR6 are both Octo Data Rate. But for some reason they are still calling them DDR, I'm guessing just because that is what people know.

 

[Sora]

GDDR5X and GDDR6 are both 8x the actual clock.

its not 8x the actual clock.
its B x DDR x ( R+F)

where R+F is the data operations on the rise and fall of the clocks, GDDR6 does 2 ops on the rise and 2 ops on the fall (hence quad pumped)

The math in the below screenshot starts with the 1750 base and is 1750 * 2 * (2+2) for 14GT/s

 

[eidairaman1]

its not 8x the actual clock.
its B x DDR x ( R+F)

where R+F is the data operations on the rise and fall of the clocks, GDDR6 does 2 ops on the rise and 2 ops on the fall (hence quad pumped)

The math in the below screenshot starts with the 1750 base and is 1750 * 2 * (2+2) for 14GT/s
View attachment 127704

1750*2*4= 14000
1750*8=14000, breaking math down is simpler than having to pemdas everything

So GDDR5 is quad pumped and GDDR6 is octo pumped

 

[Sora]

You're misusing what "pumping" actually means to come to this.

 

[Steevo]

You're misusing what "pumping" actually means to come to this.

Pumping is another word meaning data transfer or requests can occur on the leading and trailing edge of the wave form and or how many operations occur within one cycle.

 

[melk]

Have y'all been successful with pushing memory past 14000 on RTX cards? My 2060 Super doesn't seem to tolerate memory oc as high as my old 1060. I guess the new gddr6 is already running nearly maxed out, whereas the old mature gddr5 had some headroom.