Is it possible to gpu mine the new Safecoin (if so where are the details) or is it pos only?
Both are correct

The new Safecoin is POS only, however due to its robust design with 100,000+ TPS at sub-second block times, it can utilise GPUs to process these transactions and those operators can earn SAFE for doing so.
You can look up Solana Validators for more information on this, we are completing testing and development of our implementation.
Two distinct differences:
- The hardware requirements will be significantly less than Solana validators
- We have removed any KYC requirements to earn SAFE