I think nvidia counts all the vram modules together so the frequency seems way higher than it actually is. Thats what I assumed anyway, I'm not actually sure. But that is definitely normal. Mine goes up to 10,500mhz just from opening steam.
I mean the math kind of makes sense, but not really. My 4090 has 12 chips of 2gb vram, right? GPU z says mem clock is 1313mhz. Times that by 12, thats just over 15,000mhz. Yet when I run heaven it says memory speed is 10,500mhz. Anybody able to shine some light on this? Where does that 10,500mhz number come from exactly? Its clearly not from a single module, but its not from all of them running at rated speed either. So maybe the load just isn't heavy enough, or what?