Update README.md

Updated DAG size and GPU minimum memory (was 2GB, now it's 4GB as of epoch 382 on 2020-12-15)

Author: cryptomine

README.md

@@ -131,9 +131,9 @@ Because of the GDDR5X memory, which can't be fully utilized for ETH mining (yet)
 
 Only GCN 1.0 GPUs (78x0, 79x0, 270, 280), but in a different way. You'll see that on each new epoch (30K blocks), the hashrate will go down a little bit.
 
-### Can I still mine ETH with my 2GB GPU?
+### Can I still mine ETH with my 4GB GPU?
 
-Not really, your VRAM must be above the DAG size (Currently about 2.15 GB.) to get best performance. Without it severe hash loss will occur.
+Not really, your VRAM must be above the DAG size (Currently about 4.023 GB.) to get best performance. Without it severe hash loss will occur.
 
 ### What are the optimal launch parameters?