Shaun Powell's score for Cardiff was not enough to prevent defeat to Llanelli.
Llanelli secured a bonus point victory at the Arms Park as they ran out 17-38 winners over Cardiff.
The visitors produced a much improved performance on their recent form and ran four tries as they ran out comfortable winners.
Justin James, Steffan Hughes and Kristian Phillips all crossed for the visitors and a further score from replacement Kyle Evans added gloss to the win.
Captain Shaun Powell and Cardiff Blue Dan Fish responded for Martyn Fowler's men but it was not enough.
Gareth Davies opened the scoring with a snap drop goal for Cardiff inside the first five minutes but the visitors looked threatening every time they kept the ball in hand.
And they were rewarded for their attacking intent when James opened the scoring in the sixth minute. Hughes and Phillips soon added further scores and with Owen Williams converting two of the tries, the visitors were off to a fast start.
Llanelli only looked like extending their lead but a turnover resulted in a long distance try for Cardiff captain Powell. Davies converted before a Williams penalty saw Llanelli go into the interval with a 22-10 lead.
After a brilliant start to the game, it looked like Llanelli had forgotten their initial game plan as the second half kicked off. And when Cardiff flyer Fish ran in another long distance try, it was game on. Davies converted and Cardiff sensed a comeback.
It was not to be though as three further penalties from Williams steadied the Llanelli ship. And when replacement Evans scored the bonus point try, the game was up for Cardiff.
Ebbw Vale captain Damien Hudd picked up the biggest accolade of the night at the 11th Principality Premiership Awards Evening held at Principality Stadium, after leading his side to the title for the first time.
Wales assistant coach Robin McBryde is predicting a tough battle against England on Sunday despite the fact they may not be considered to be at full strength. Players will be out to impress Eddie Jones which makes England a dangerous proposition, he says.
Wales U20 captain Tom Phillips and performance psychologist Dr Rich Neil explain why spending three days at Monmouth RFC has further strengthened the togetherness of the squad ahead of the #WorldRugbyU20s
Alongside Scarlets flanker James Davies and Cardiff Blues centre Cory Allen, three Wales Sevens core players have made the extended training squad for GB Sevens. Wales Head coach Gareth Williams tells WRU TV's Graeme Gillespie why Luke Treharne, Sam Cross and Luke Morgan earned selection in the initial training squad for Rio.
Wales Sevens head coach Gareth Williams tells WRU TV's Graeme Gillespie he has had to overcome a number of injuries before naming a competitive squad for this weekend's penultimate round of the World Series in Paris.
Merthyr were officially crowned champions of the SSE SWALEC Championship at Dowlais on Saturday where captain Andy Powell paid tribute to his side who have earned promotion to the Principality Premiership