Fox2232:

Would require 7nm I/O die and APU as one chip instead of separate CPU and GPU chiplet. 5700 XT has ~460GB/s available bandwidth for 20 WGPs at around 2GHz. Let's say 8 WGPs at 1.4GHz for power efficiency... that would be around 128GB/s. Could probably be unhindered even at 100GB/s. But having mere 4GB of dedicated HBM would make all bandwidth concerns go away.

Fox2232:

Would require 7nm I/O die and APU as one chip instead of separate CPU and GPU chiplet. 5700 XT has ~460GB/s available bandwidth for 20 WGPs at around 2GHz. Let's say 8 WGPs at 1.4GHz for power efficiency... that would be around 128GB/s. Could probably be unhindered even at 100GB/s. But having mere 4GB of dedicated HBM would make all bandwidth concerns go away.

Aura89:

I feel like i remember AMD saying they won't utilize the 2nd Zen2 chip area for a GPU at least for Zen 2. I could be wrong though.

Fox2232:

That's correct, that's why I wrote that it would not be separate chiplet.