If you are like me and bought GTX 1080 into older PC, then you maby noticed some serious peformace loss, i have seen heaven benchmark scores 3000+ and i only get 2500~ you will lose at least 20% peformance and firestrike scores +24000 and i get near 22000. In "cash" for me i lost 155 EUR . This is not help request this post is more like infomation for others. And sorry for crapy english
All in one : http://imgur.com/a/sZQyA
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http://imgur.com/waUT4oi