My ethereum GPU miner had been down for 6 months after accidentally bricking an AsRock board while trying to update a bios. I've since purchased a used ASUS b250 mining expert. I spent last weekend installing my old R9 380 cards (because I had them) and fired the thing up to find that I'm getting >49mh/s per card with stock settings. Overclocking today, I'm getting >53mh/s per card.

I figured these would be worthless, but I'm pleasantly surprised. Can anyone explain why card that seem to be reported as getting mh's in the 19 range are getting 50+?