Owners Manual
Page 22
Otherwise, your computer during a memory upgrade, keep them separate from any new memory module(s) that you may not start properly. CAUTION: Do not install ECC or DDR3U memory modules. Procedure 1 Press ... the Memory Module(s) CAUTION: If you remove the original memory module(s) from your computer may have, even if you purchased the new memory module(s) from Dell.
Otherwise, your computer during a memory upgrade, keep them separate from any new memory module(s) that you may not start properly. CAUTION: Do not install ECC or DDR3U memory modules. Procedure 1 Press ... the Memory Module(s) CAUTION: If you remove the original memory module(s) from your computer may have, even if you purchased the new memory module(s) from Dell.