| The Ospreys, who will move to their new stadium at Morfa next season, saw off their Irish opponents thanks largely to fly-half Matthew Jones who notched a try, two conversions and a penalty to set up a semi-final date with Llanelli Scarlets.
Stefan Terblanche opened the scoring with the first try of the game when he chipped through and beat Ulster's Tyrone Howe for the touchdown.
Matt Jones added the extras before Ulster flyhalf David Humphreys got his side off the mark with a penalty.
Shane Williams was once again on form for the Ospreys proving his Lions credentials. Jones stretched his side's advantage in the second half with penalty but that was soon cancelled out by Humphreys.
But Jones added three more to his own tally shortly after before capping the win by getting on the end of the best move of the game.
Elvis Seveali'i produced a sublime reverse pass to scrum-half Jason Spice, and Williams then took it on.
The Irish defence scrambled back, but Terblanche came in on an angle to collect a pass before providing the opportunity for Jones to touch down.
Ulster claimed a late penalty try and conversion in the final moments, after Humphreys had been hauled down just short of the line.
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