Designed For Flex System x 280 X6 Compute Node 7903 (2.5");x 480 X6 Compute Node 7903 (2.5");x 880 X6 Compute Node 7903 (2.5"); System x 3850 X6 3837 (2.5");x 3950 X6 3837 (2.5"); Flex System x 240 M5 (2.5");x 280 X6 Compute Node 7903 (2.5");x 480 X6 Compute Node 7903 (2.5");x 880 X6 Compute Node 7903 (2.5"); System x 3850 X6 3837 (2.5");x 3950 X6 3837 (2.5")