16GB KIT (4 x 4GB) For IBM-Lenovo System Series x3400 (7973-xxx) x3400 (7974-xxx) x3400 (7975-xxx) x3400 (7976-xxx) x3400 (7978-xxx) x3450 (7948-56X) x3450 (7948-58X) x3450 (7948-x2X) x3450 (7948-x5X) x3450 (7948-xBX) x3450 (7948-xxx) x3500 (7977-xxx) x35<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>16GB KIT (4 x 4GB) DIMM DDR2 ECC Fully Buffered PC2-5300 667MHz RAM Memory</li><li>Genuine A-Tech Memory</li><li>Lifetime Warranty</li><li>Toll Free Technical Support 1-866-557-4527</li><li>Designed For IBM-Lenovo System Series. (See Compatibility List Below)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/61P8%2BdpE0ZL.jpg" noproxy>