I'm not so sure I like these cards, I got 5 of them installed; The sixth riser is bad unfortunately. Here is what I have noticed so far...
These cards have tiny fans on them... They do not cool the card well and overclocking is not going to be a possibility without extra fans, luckily I ordered some fans today. That being said, the fans that are on the card are extremely quiet, which is good because I have to run them at 100% to not top 80C at stock clocks.... I might try out another card if at all possible... I love my MSI cards
Edit: oh yea, my hashrates. I am just sitting at stock settings now because I am tired and don't want to mess with the cooling situation right now. I get around 412 Khash, pretty consistently across all cards. I think they are capable of 450khash with better cooling though.