Do your 2GB still work on ETH?

Just started noticing many 2GB GPUs for sale. Also noticed a few threads with people having issues.

I had mine mining ZEC but decided to try ETH and all of them don't work except for a Radeon 6990 2GB (Pre-GCN) and a 7850 on one rig running Windows 10 with a bunch of 470s.

This is all based on the Claymore 7 ETH miner.