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Memory Clock reported by GPU-Z and Nvidia performance overlay.


New Member
Oct 17, 2023
3 (0.01/day)
For RTX 4070 super, the memory clock is 1312.7MHz reported by GPU-Z but is 10501 MHz by Nvidia performance overlay, 8 times larger. Does anyone know how to reconcile those two numbers?

Oct 22, 2014
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Sep 27, 2019
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10501mhz (x2) = 21002mhz actual speed,

1312.7 (x16) = 21003.2mhz actual speed.

Your vrams are running at 21ghz.
Jan 29, 2012
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reconciliation takes time


Dec 16, 2012
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VRAM clock speed is usually reported diffentially in different programs thanks to different DDR technologies.
May 22, 2024
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It gets even more confusing when (the last time I checked) MSI Afterburner let you downclock your VRAM by 300MHz, off an indicated 7000MHz effective value on a previous setup with 14GHz VRAM. It did take effect, but it's also a drop in a bucket for what I wanted to do back then.


New Member
Oct 17, 2023
3 (0.01/day)
Hmm. With 7168 shading units and GPU boosting up to 2865MHz, I can claim that my SU is running at 20THz, right in the middle of inferred territory.

Joking aside, thanks everyone for replying.


Staff member
May 14, 2004
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Not a bug, just a different scale of measurement
Correct, GPU-Z will always show the underlying actual clock frequency, whereas more marketing oriented people will show you the highest number, i.e the "effective" clock rate, which in your case is 8 times higher, due to various techniques of transmitting more than one bit of data during each clock cycle. Google "double pumped" and "PAM4"