The only game i can remember that had an option for quincunx was Soldier of Fortune 2, but I dont have it installed to test it
As I recall, Quincunx really sucked though visually. The original blur filter even.
If I'm wrong please kick me, my memory isn't my strongest point and I think I remember GeForce2 MX400 had hardware support for it but it still sort of sucked.
Very low performance hit though, I remember that.
According to this threadYou could force enable it using the NV control panel