Hi, After 5 replacement units, Razer have finally told me the fan bearings are expected to rattle each time they start to spin. You can cause your fans to start spinning by waiting for them to stop then: Go into Synapse / Performance Switch to Manual then back to Auto. As you switch to manual, the fans will start and 99% of the time the fan bearings will rattle as the voltage is applied and they start spinning. Its sounds like an old HDD rattling away and can last several seconds. Switching back to auto stops the fans, then you can do it again. Here is a short YouTube where I demonstrate - I made a similar video for the previous 4 units they sent me in an attempt to fix this: Does your Razer Blade have the same issue? Do Razer Blade 15's have the same issue? Has anyone heard fan bearing rattles on non-Razer notebooks? Has anyone got any technical information about fan bearings rattling? If you review notebook computers I suggest we start reviewing fan bearing rattle as it's a buying factor like keyboard layout, back-light bleed and screen flex. What are your thoughts and experiences with the fan bearing rattle?