This 290W power supply is compatible with Dell Optiplex GX520 GX620 740 745 755 210L 320 330/Dimension C521 3100C GX280. It delivers stable power output to keep your system running smoothly for all daily computing tasks like web browsing, document editing and more. Rigorously tested for safety and reliability, it protects your PC components from power surges and unstable currents.