You should just about be ok, especially if you follow the undervolting guide in the Vega thread. Make sure you power the card with two seperate pci-e leads and not a single lead with the pair of daisy chained connectors. That is a good choice of psu and Corsair's SF units are argueably the best SFF psu's available at the moment. It's a pity they are so difficult to get at the moment.