https://wccftech.com/nvidia-ampere-ga102-250-gpu-spotted-on-geforce-rtx-3090-graphics-card-rtx-3080-ti-spec-change/

A user on Hardwareluxx's Forums has confirmed the existence of NVIDIA's Ampere GA102-250 GPU SKU which was previously expected to be featured on the GeForce RTX 3080 Ti graphics card. It was spotted when the forum member took apart his GeForce RTX 3090, only to reveal that the GPU had initially been labeled as the GA102-250 SKU instead of the GA102-300 which is the official SKU used on the RTX 3090.

The NVIDIA GA102-250-KD-A1 GPU only existed in the rumor mill but now we can confirm that this is indeed a real chip. Initially planned for the GeForce RTX 3080 Ti graphics card, it looks like NVIDIA decided that they could use a further cut-down SKU to power the upcoming flagship while this SKU can be utilized for the GeForce RTX 3090 graphics card. You can clearly see that the GA102-250-KD-A1 GPU label has been cut-off and instead, it's been repurposed as the GA102-300-A1 SKU. What's interesting is that the GA102-250-KD-A1 was expected to feature 78 SM units enabled for a total of 9984 CUDA cores whereas the RTX 3090 with its GA102-300-A1 GPU packs 82 SMs or 10496 cores.