Wales internationals Tom James and Martyn Williams both scored against Treviso to ensure Cardiff Blues remain the early Pro12 pace-setters.
Young wing Alex Cuthbert opened the scoring for the Welsh region before James touched down as the 24-year-old ended a flowing Blues move.
Veteran flanker Williams and centre Dafydd Hewitt added second-half tries while Gareth Davies kicked 11 points.
Kris Burton kicked Treviso's points as Cardiff extended their perfect start.
Giant Cuthbert, already a Wales Sevens representative, made an immediate impact with two powerful runs in the first five minutes, the second ending with a stretch to his full 6ft 6ins to place the ball on the try line.
The Italians, without a win outside Italy since December 2007, replied as Australian fly-half Burton converted two drop goals, setting the pattern for the half as his boot kept cancelling out penalties by opposite number Davis.
The only exception resulted from a brilliant Blues move, sparked by a Maama Molitika's break in his own 22 and finished by wing James, who juggled Lewis Jones' final pass before going beneath the posts.
It gave the winger a record 30th touchdown for the Blues, overtaking former favourite Jamie Robinson's tally.
Jones almost matched Cuthbert's debut try but the 18-year-old scrum-half failed to gather his own kick ahead after darting away from a line out.
Both sides finished the half a man short as Blues locked Deiniol Jones and Treviso number eight Manoa Vosawai saw yellow cards.
But Williams, who could perhaps consider himself unlucky not to be on World Cup duty in New Zealand with Wales, showed a cool head as the experienced openside took a return pass from James to score.
Treviso rarely threatened the Blues line but wing Benjamin de Jager was only stopped by a desperate ankle tap from the covering Gavin Evans.
The Blues kicked a stream of penalties to the corner in the hunt for a bonus point.
But it was only after replacement Gonzalo Padro was finally sin-binned that Hewitt darted over to complete the job and secure their second bonus-point victory at the start of the new season.
Cardiff Blues: Czekaj, Cuthbert, Evans, Hewitt, James, G. Davies, L. Jones, Hobbs, Thomas, Andrews, Paterson, D. Jones, Molitika, M. Williams, Pretorius.
Replacements: Mustoe for Cuthbert (65), Sweeney for G. Davies (48), Rees for L. Jones (48), Trevett for Hobbs (65), R. Williams for Thomas (74), Harford for Andrews (74), Tito for D. Jones (48), Rush for Molitika (48).
Benetton Treviso: Nitoglia, De Jager, Galon, Morisi, Williams, Burton, Picone, Rizzo, Sbaraglini, Allori, A. Pavanello, Bernabo, Minto, Vermaak, Vosawai.
Replacements: Iannone for Morisi (55), Chillon for Picone (55), Muccignat for Rizzo (45), Vidal for Sbaraglini (45), Di Santo for Allori (45), Padro for A. Pavanello (61), Filippucci for Bernabo (45).
Not Used: de Waal.
Referee: Andrew McMenemy (RFU)