There was the HD7000 series, Nvidia launched their mid-range parts as the GTX670/680 because they believed they were enough to beat the HD7950/7970 (instead of just launching the GTX780 as the GTX680 there and then) then AMD magically "found" driver/firmware updates that enabled the 7950/7970 to start beating the 670/680 and for a lot less money.Yes, because they've never shown an ounce of such nous before then
There was actually a class action threatened by US customers over that, as they believed they had been harmed by AMD intentionally holding back performance until after the competition launched.