I have been mining rvn coin for the last few weeks and am looking at getting a few more cards. I found a Pandaminer b5 with 7 rx460s 4gb in. They are selling it at $500, so not expensive. I can't seem to find any reliable hashrate numbers for these cards on kawpow. I have free power at my workshop so that's not an issue. But I don't want to buy a paperweight.

Any help will be appreciated.