Screw it - I'm not wasting money sending it back. I have it powered on hashing at 8.7 TH/s.... Hopefully I'll make my money back what with slushpools payouts and increasing value of BTC. It cost me nearly €2,000 to get the PSU and R4 from China to Ireland what with shipping and import taxes. One good point is I have free electricity so should make money back that bit sooner.