Step 2: If you get the small version of the Task Manager, click on the More details button to open the full-version. The easiest way is to simultaneously press Ctrl + Shift + Esc keys. There are numerous ways out there to open the Task Manager. Here is how to check the number of RAM slots and empty slots on your Windows 10 computer. Check if there is an empty RAM slot on your Windows 10 laptop Windows 10 now displays the total number of RAM slots on your computer as well as available empty slots in the Task Manager. Windows 10 users will be pleased to know that you don’t need to a third-party program to check the number of RAM slots and empty slots on your computer.