Quote from: Empiricist on June 16, 2017, 06:49:45 PM

I've been mining successfully using Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v9.5 on Windows 10 using 2x480 4gb cards. The last two days Ive been getting an error the "DAG file (epoch# 129) creation failed" and "open cl error cannot write big buffer with dag"

Here are the options I've been running it with:
-epool us1.ethpool.org:3333 -ewal 0x0eaccc7749599bccd3b91a41afd51f9f45f895e8.riglediggle3 -epsw x -dpool http://dcr.pool.mn:4722 -dwal lilbit.1 -dpsw 1

This system has been running fine for months, so I'm assuming things were broken by a hardware failure or windows update. Any other options?

I'm guessing Claymore made some fixes by now but on Apr 13, 2016 there were other people getting that error (I did a search in the forum) and Claymore responded with this"

"Read OP:
1. Check disc space.
2. remove DAG files and start miner.

I will fix all these issues soon."

not sure if that will help send you in the right direction or not.

I'm assuming you are getting it on both cards. If so, I doubt it's a hardware failure. If it's only on one card, then maybe.