At 146mm², the AD107 is the smallest Ada Lovelace GPU so far. The "400" usually means it is a fully-enabled GPU, which should be true considering that the RTX 4060 packs 3072 CUDA cores. This also means we could see the RTX 4050 (Ti) in the future with a cut-down version of the AD107 GPU. Bear in mind that the same AD107 GPU was used on Geforce RTX 40 Laptop graphics cards.
The GPU was leaked by MEGAsizeGPU over at Twitter, and caught by Videocardz.com.
The Nvidia Geforce RTX 4060 is scheduled to launch in July at $299 and should pack 3072 CUDA cores and 8GB of 17Gbps GDDR6 memory on a 128-bit memory interface.