While the original Geforce RTX 4070 used the AD104 GPU for the RTX 4070, it now appears that versions of the RTX 4070 with a cut-down AD103 GPU are already selling in the market. The higher-end AD103 GPU was used in the original RTX 4080 with 76 enabled Stream Multiprocessors (SMs) and the RTX 4070 Ti, where it had 66 SMs enabled. Nvidia has recently started using the same GPU for the RTX 4080 SUPER, with all 80 SMs enabled.
The latest addition is the AD103-175 GPU with only 46 SMs enabled, as confirmed by Techpowerup.com, which makes it perfect for the RTX 4070. This allows Nvidia to use the GPU when it does not match other graphics card specifications.
Nvidia did not officially announce the update, and we would not be surprised if it ends up only in certain regions, but don't be surprised if GPU-Z does not recognize your Geforce RTX 4070 graphics card, at least not until the next GPU-Z update.