Spotted by Videocardz.com, the rumor is a combination of reports from HKEPC and @koptite7kimi, both of which are citing their own sources.

While the rumored RTX 3080 Ti will pack the same amount of CUDA cores as the RTX 3090, it will lack NVLINK support, have 20GB of 19Gbps GDDR6X memory which is 4GB less, and a slightly narrower memory interface at 320-bit. The TGP is rumored at 320W.

Now, all we are missing is the price which will probably be somewhere close to $999, considering that the RTX 3090 is priced at $1,499 and the RTX 3080 goes for $699.