Only the 8GB model. Hardware Unboxed latest gpu market update shows the 16GB model is selling for $50 above MSRP at $400 and the 8GB model for $280. You definitely shouldn't buy it at $400 since the 6700xt handily beats it and costs $330.

https://www.youtube.com/watch?v=fISiTHe89eA

The RX 7600 costs $270, has 8GB of VRAM and AV1 encoding, and outperforms the 8GB a770. So I really don't see an objective reason to buy the a770 aside from supporting a 3rd player in the gpu market (which is a good reason IMO).