The former Blackburn Rovers centre-back moved to Loftus Road from Anzhi Makhachkala on deadline day in the winter window for a reported £12.5m.
"I have seen for myself now we have enough to remain in this league," Samba told the club's official website. "This is the English league and it is physical. It was a more intensive style of play than it was in Russia."
QPR currently sit six points away from safety in the table with 13 games left to go in the campaign.