You'd think with ATI having the performance, value and power efficiency lead for so long -- at least since the 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 su