The Springboks had their bonus point within 12 minutes as they overwhelmed Romania with a fast start before the heavens opened and the rain made for more challenging conditions.
As expected they were dominant in all facets of the game and while Uruguay and Portugal have provided a stern test for tier-one nations at this World Cup, Romania are simply not at the same level having also lost their opener 82-8 to Ireland.
The Boks meet Ireland next in their third pool game in Paris on Saturday, which will be a huge step up in quality but also see a return of their first-choice players to the starting XV.
They ran in 12 tries in all with further scores for fly-half Damian Willemse, hooker Deon Fourie, wing Grant Williams (two), full-back Willie le Roux and a penalty score in what became a box-ticking exercise after the first quarter of the game.
"I'm especially happy with a couple of things we tried," Bok coach Jacques Nienaber said.
"The three different hookers that we used, I thought that paid off.
"Then Faf (de Klerk) got some exposure at fly-half so I thought a lot of things that we wanted to get out of the game, we got."
Hordes of Springboks fans gathered outside the Stade de Bordeaux before the match in their green jerseys, several sporting nothing but shoes and swimming trunks with the South Africa flag on in homage to famous images of scrum-half Faf de Klerk after their 2019 World Cup win.
In contrast, there were only a scattering of Romania fans.
The Boks lost prop Vincent Koch when he was injured in the warm-up, his place in the side taken by Trevor Nyakane.
Romania, beaten 21-8 in their previous World Cup meeting with the Boks in 1995, were always going to be up against it but did not help themselves with a tentative start.
They were weak in the tackle and left too much space for their opponents to play as South Africa picked off their errors with four tries in the opening 12 minutes.
The Boks dominated the breakdown, winning 12 turnovers in the match, but the scoring slowed when a deluge of rain fell midway through the first half as they led 33-0 at halftime.
Fourie came on at the break for his first appearance at hooker since 2018. The loose-forward took over from Bongi Mbonambi and is now second-choice number two in the squad after injury to Malcolm Marx. He acquitted himself well under admittedly little pressure.
First-choice scrum-half Faf de Klerk also came on at fly-half after 55 minutes in another of coach Jacques Nienaber’s experiments, but his lack of accuracy off the kicking tee may hasten calls for Handre Pollard to come into the squad as the replacement for Marx.
"We had the first 25 minutes in the Irish game and today the last 20 minutes of the first half, we can take some positives," Romania coach Eugen Apjok said.
"We need to learn a lot about how to manage, especially in the breakdown."
