The modules are compatible with my Lenovo laptop and have improved operating speed, If you're ordering be aware that the pictures at the top of the page show 2 x 4GB memory modules. You get 1 x 4GB. To compound the matter, the description in the chart comparing this product to others shows 4GB memory capacity BUT 8 GB Size. If you want to add 8 GB to your laptop, order two modules. The ad needs to be changed to accurately reflect what the consumer is getting.