The RTX4070TI isn't a 70 series card but a rebadged 60/60TI series card. The GPU is under 300MM2 too. People keep forgetting Nvidia released an AD103,so the AD104 actually is now the same position as the GA106 in the lineup and the AD103 is basically where the GA104 was positioned.
But even ignoring die size,just look at the shader count:
NVIDIA AD102, 2520 MHz, 16384 Cores, 512 TMUs, 176 ROPs, 24576 MB GDDR6X, 1313 MHz, 384 bit
www.techpowerup.com
NVIDIA AD104, 2610 MHz, 7680 Cores, 240 TMUs, 80 ROPs, 12288 MB GDDR6X, 1313 MHz, 192 bit
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The RTX4070TI has 47% of the shader count of the RTX4090,half the VRAM capacity and 50% of the memory bandwith.
Now look at the RTX3090TI vs the RTX3070TI and RTX3060:
NVIDIA GA102, 1860 MHz, 10752 Cores, 336 TMUs, 112 ROPs, 24576 MB GDDR6X, 1313 MHz, 384 bit
www.techpowerup.com
NVIDIA GA104, 1770 MHz, 6144 Cores, 192 TMUs, 96 ROPs, 8192 MB GDDR6X, 1188 MHz, 256 bit
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NVIDIA GA106, 1777 MHz, 3584 Cores, 112 TMUs, 48 ROPs, 12288 MB GDDR6, 1875 MHz, 192 bit
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The RTX3070TI has 57% of the shader count of the RTX3090TI and 60.3% of the memory bandwidth of the RTX3090TI.
The RTX3060 has 33% of the shader count of the RTX3090TI and 35.7% of the memory bandwidth of the RTX3090TI.
Now look at how it is compared to the RTX3060TI:
NVIDIA GA104, 1665 MHz, 4864 Cores, 152 TMUs, 80 ROPs, 8192 MB GDDR6, 1750 MHz, 256 bit
www.techpowerup.com
It has 45.2% of the shader count of the RTX3090TI and 44% of the memory bandwidth.
So the RTX4070TI essentially has a dGPU chip about the same of a 106 series chip,but relative performance to the top is closer to a 60TI/60 Super class relative performance.