NSW dismissed WA for 386 in their second innings today, leaving them chasing just 88 runs for victory and NSW cantered to 91 for two in 24.4 overs to claim maximum points for the second consecutive match.
The defending Shield champions now have two outright wins in the four-day competition.
NSW cruised to 475 for seven declared in their first innings after winning the toss, with young all-rounder Aaron O'Brien living up to his promise with an outstanding 147 to earn man-of-the-match honours.
The Blues' big win was all the more remarkable as they were without Test stars Glenn McGrath, Brett Lee, Nathan Bracken, Michael Clarke, Simon Katich and injured captain-wicketkeeper Brad Haddin.
In Adelaide, a stubborn last-wicket stand between South Australia's former Test paceman Jason Gillespie and Paul Rofe thwarted Queensland's victory push on a manic epic final day of the rain-affected match.
South Australia finished at 309 for nine, 64 runs short of the 353 required to win.
Left-arm speedsters Mitchell Johnson (5-39) troubled all the batsmen to claim his maiden first-class five wicket haul, while veteran Michael Kasprowicz (2-66) got the better of former Test batsmen Matthew Elliott and Darren Lehmann after both had threatened.