Isacc Boss (right) produced a man-of-the-match display
Ulster 43 (19)
Tries: R Best, Bowe, Steinmetz, McMillan.
Cons: Humphreys 5.
Pens: Humphreys 5.
Ospreys 7 (7)
Ulster jumped back to the top of the Magners League with a bonus-point win over a dismal Ospreys at Ravenhill.
The home side ran in four tries through Rory Best, Tommy Bowe, Paul Steinmetz and Neil Mcmillan, with fly-half David Humphreys kicking another 23 points.
Lee Byrne put the Ospreys ahead with a seventh-minute try, but Ulster fought back to lead 19-7 at the break.
The Welsh side totally folded after the break as Ulster romped to a deserved win in front of a 10,000-strong crowd.
Humphreys notched an early penalty for Ulster but Gavin Henson's break gave Byrne the space to cross, with James Hook adding the extras.
A wind-assisted Humphreys penalty from inside his own half cut the deficit before Ulster edged ahead in the 27th minute.
From a well-worked line-out move, man-of-the-match Isaac Boss reversed play back to hooker Best, who rumbled over in the corner.
Ospreys number eight Ryan Jones was yellow-carded in the 33rd minute for continually lying on the ball, and Humphreys took full advantage with a 48-metre penalty.
The former Ireland international then made further use of the wind at his tail with a second enormous effort from well inside his own half to put his side 19-7 ahead.
Ospreys' problems were further exacerbated when Alun Wyn Jones followed Jones to the bin for a blatant obstruction on the lively Boss.
Ulster began the second half in exquisite style with a flowing move finished off by replacement Bowe.
A brilliant break by Boss on the hour set up Steinmetz for Ulster's third try.
Then eight minutes later, replacement McMillan swallow-dived in for the bonus touchdown.
Ulster: B Cunningham, M Bartholemeusz, P Steinmetz, P Wallace, A Maxwell, D Humphreys, I Boss; J Fitzpatrick, R Best (capt), B Young, J Harrison, capt, T Barker, S Ferris, K Dawson, R Wilson. Replacements: P Shields for Best (66), D Fitzpatrick for J Fitzpatrick (70), M McCullough for Barker (42), N McMillan for Ferris (62), K Campbell for Boss (69), K Maggs for Wallace (59), T Bowe for Maxwell (42).
Ospreys: L Byrne; N Walker, S Parker, J Hook, R Mustoe; G Henson, J Marshall; D Jones (capt), B Williams, A Jones, A Wyn Jones, I Evans, J Thomas, R Pugh, R Jones. Replacements: E Shervington for Williams (62), P James for A Jones (69), B Cockbain for Wyn Jones (62), L Beach for Pugh (75), J Spice for Marshall (79), A Bishop for Byrne (73), S Terblanche for Mustoe (79).
Referee: Peter Allan (SRU).