https://wccftech.com/intel-confirms-xe-dgpu-cadence-and-reveals-foundry-strategy-for-xe-gpu-lineup/

Intel revealed a ton of details on Architecture Day 2020 and one of the key disclosures was how their GPU strategy aligns with external foundries. The company disclosed how they were tackling the four tiers of their GPUs and also (in the process) confirmed my exclusive on Ponte Vecchio. While the company did not comment on a consistent cadence in the presentation, they did confirm the same during the Q&A that followed.

Basically, the company has confirmed that DG1, Tiger Lake, and SG1 (a flavor of DG1 designed for servers) will be manufactured inhouse on the Intel 10nm SuperFin process. The upcoming Intel Xe HPG GPU for gamers will be made on an external foundry process - quite likely TSMC (and probably the 7nm process considering the 2021 timeline). Xe HP and the monstrous GPU they demoed with 4 tiles and 16384 cores will be made on the enhanced version of their SuperFin process which they have not named yet but had up and running in their labs.