The stock OEM cooler is designed for lower-power chips. Upgrading to an i7 often requires an improved aftermarket cooler to prevent thermal throttling.
Many Acer systems using this board come with a low-wattage PSU (typically 220W to 300W). If you upgrade to a high-TDP processor like the i7-4770 (84W) , you may need to upgrade to a 450W+ power supply to ensure stability, especially if adding a dedicated graphics card. ms7869 ver 10 cpu support verified