Upgraded my desktop RAM 12 months ago, and these memory sticks have been sitting in a drawer ever since. Work without any issues in my machine. Specifications from Patriot are here: https://6a8e8418-b0fd-4b53-80b6-92c942f51229.filesusr.com/ugd/20c502_365dea7a8b254fbf8f3d77210ce39e08.pdf Please make sure these are right for the system you plan to install them in BEFORE buying.