The 3090 is not faster/sometimes a bit slower than my previous Radeon VII. I had a similar problem when trying to speed up NeatVideo with two Radeon VII - seeing no gain (even when using a special NeatVideo beta version specifically made for multi GPU use - big thanks to ABsoft).

The support team at ABsoft/NeatVideo are really friendly and did a fantastic job in pinning down the problem: The data is sent from the CPU to the GPU with about 13 GB/s, but the return path is only about 7 GB/s on my system - which is way to slow!

I'm using a Threadripper 2920X CPU on a Gigabyte Designare EX mainboard and as the PCIE-controller is inside the Threadripper, the problem is most likely the CPU. But is it only my CPU, is it only the 2920X or is it every Threadripper?

I need your HELP:

Everybody who has a Threadripper (1000- and 2000-series) and is willing to run a small benchmark tool (all in all takes less than 5 min.), please send me a PM. Any graphicscard (even old ones with DDR5 VRAM) will do, as long as its in the PCIE 16x slot.

So, lets see if I just got unlucky with my Threadripper, or if AMD has intensionally crippled there flagship CPUs.