I found the die size around 806mm2
Edit: EETimes went ahead and published the article before its due
Nvidia Reinvents GPU, Blows Previous Generation Out of the Water
The first chip built on Ampere, the A100, has some pretty impressive vital statistics. Powered by 54 billion transistors, it’s the world’s largest 7nm chip, according to Nvidia, delivering more than one Peta-operations per second. Nvidia claims the A100 has 20x the performance of the equivalent Volta device for both AI training (single precision, 32-bit floating point numbers) and AI inference (8-bit integer numbers). The same device used for high-performance scientific computing can beat Volta’s performance by 2.5x (for double precision, 64-bit numbers).
The Tensor Cores now also natively support double-precision (FP64) numbers, which more than doubles performance for HPC applications.