Radeon HD 4000 series -- NVIDIA would be in all kinds of trouble, but it's only now that AMD's graphics division has finally taken the lead in quarterly shipments. This is according to Mercury Research, whose analysts place the split at 51 to 49 percent in favor of ATI -- still a tightly contested thing, but it compares very favorably to the Red Team's 41% share in the same quarter last year. This data is concerned with discrete GPU shipments only (laptops included), whereas on the integrated front Intel continues to reign supreme with 54 percent of the market shipping its cheap and cheerful IGP units. ATI has made forward strides there as well, however, with 24.5% ranking ahead of NVIDIA's 19.8%. If Apple shifting its iMac and Mac Pro lines away from the Green livery wasn't enough, perhaps these numbers will finally start ringing some alarm bells over at NV HQ.