Just the cards I expect to be paid off in around 3 months. I got a really good deal on them through preorder on amazon and also Zen is pretty profitable at the moment. Daily this rig probably makes around £12 worth of Zen, however, I have seen great price increases since I started mining and this has already paid for all of my rigs due to the ease of mining when I first got into it. So I guess I am one of the lucky ones! That £12/day may be worth £36 in a few months time is the easiest way to think of it!