HP Pavilion p6404y Desktop PC support
CPU Fan Noise Is Louder After Updating System BIOS to Version 5.16
You may notice a higher level of fan noise after you upgrade the system BIOS to Version 5.16 (SoftPaq SP46428).
No action is required. The BIOS update includes a change to processor cooling fan speed to enhance the system. This change does not affect system performance.