A turbine blade comprising: an airfoil, platform, and integral dovetail; said airfoil including a concave pressure side and transversely opposite, convex suction side extending chordally between opposite leading and trailing edges (24,26) and extending in span from root to tip; said airfoil tip including transversely opposite first and second ribs (36,38) extending outwardly from a common tip floor, and integrally joined together at said leading and trailing edges (24,26) to conform with said pressure and suction sides, respectively; said airfoil increasing in width aft from said leading edge to a hump having maximum width, and decreasing in width aft therefrom to said trailing edge; a tip baffle which is convex facing toward said second rib conforming with said suction side, extending chordally aft between said leading and trailing edges (24,26) and nested transversely between said first and second ribs (36,38) to conform with said convex second rib and bifurcate said airfoil tip into first and second tip pockets (44,46) bounded by said ribs (36,38), with said second pocket extending aft of said first pocket along said first rib, characterised in that said tip baffle commences integrally with said second rib between said leading edge and said hump, and terminates integrally with said first rib between said hump and trailing edge in coplanar elevation above said tip floor, and said second pocket is bounded by the tip baffle and the second rib along said first pocket and by both said first and second ribs (36,38) aft of said first pocket, a forward end of said tip baffle blends tangentially with said second rib at an acute included angle bounding a forward portion of said second pocket, wherein an aft end of said tip baffle blends tangentially with said first rib at a shallow included angle therewith and bounds an aft end of said first pocket. an airfoil, platform, and integral dovetail; said airfoil including a concave pressure side and transversely opposite, convex suction side extending chordally between opposite leading and trailing edges (24,26) and extending in span from root to tip; said airfoil tip including transversely opposite first and second ribs (36,38) extending outwardly from a common tip floor, and integrally joined together at said leading and trailing edges (24,26) to conform with said pressure and suction sides, respectively; said airfoil increasing in width aft from said leading edge to a hump having maximum width, and decreasing in width aft therefrom to said trailing edge; a tip baffle which is convex facing toward said second rib conforming with said suction side, extending chordally aft between said leading and trailing edges (24,26) and nested transversely between said first and second ribs (36,38) to conform with said convex second rib and bifurcate said airfoil tip into first and second tip pockets (44,46) bounded by said ribs (36,38), with said second pocket extending aft of said first pocket along said first rib, characterised in that said tip baffle commences integrally with said second rib between said leading edge and said hump, and terminates integrally with said first rib between said hump and trailing edge in coplanar elevation above said tip floor, and said second pocket is bounded by the tip baffle and the second rib along said first pocket and by both said first and second ribs (36,38) aft of said first pocket, a forward end of said tip baffle blends tangentially with said second rib at an acute included angle bounding a forward portion of said second pocket, wherein an aft end of said tip baffle blends tangentially with said first rib at a shallow included angle therewith and bounds an aft end of said first pocket.