Samsung original 4GB， 240-pin DIMM， DDR3 PC3L-12800 desktop memory module (M378B5173EB0-YK0)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Dell OptiPlex 3040 Desktop DDR3 RAM Memory</li><li>Model: M378B5173EB0-YK0</li><li>Capacity: 4GB</li><li>Pins: 240</li><li>Data Transfer Rate: 1600Mhz</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41G8FIwjzRL.jpg" noproxy>