Can i mine Zcash with a ATI 6850?
From page 1 of this thread:
This version is for recent AMD videocards only: 7xxx, 2xx, 3xx and 4xx, 1GB or more.
So no. I think you can use his XMR miner with older 6XXX cards so instead of scrapping it you can use it for something.
XMR, yes, but 1GB is too low, just an example HD 5870 1Gb gives 200h/s, same with 2Gb gives 300h/s, sell it while you still can recoup something...