Mac Pro 4870 5770 5870 Video Card 75mm Fan Replacement 4-Pin header with approximately 2 3/4" (70mm) power line Fan Dimension (Diameter x Height) approximately 2 7/8" (75mm) x 15/16" (24mm) Mounting hole center to center distance are approximately: 1 1/2" (37mm), 1 1/2"(37mm) and 1 1/2" (37mm)