Eric Elwood scored all Connacht's 6 points with two penalty goals in atrocious conditions, and despite two second-half tries to Pau, the Irish province was never in danger of missing out on a place in the next round.
France international Damien Traille and winger Rida Jaouher scored second-half tries to give Pau the victory, but the result was academic.
Full Details at: www.connachtrugby.ie
London Irish's exploits in Europe ended as Narbonne took them apart 29-10 at Parc des Sports et de l'Amitie. Narbonne took an early 12-0 lead in the tie
There was more woe for Irish when winger Julien Candelon crossed for the first try of the game - his second against the Exiles in a week - and the deadly Rosalen's conversion gave the home side a 12-point lead overall. Back-rower Frederic Martinez added a second try for Narbonne, Rosalen again converting, while all the visitors could manage was a Mark Mapletoft penalty goal as the home side took a daunting 26-3 lead into the half-time break.
Beziers earned a quarter-final meeting with Bath after a 24-8 victory over Grenoble.