I tried overclocking the clock frequency of Intel CPU core i7 920 to 3717 MHz (3.7 GHz) on my own personal computer with ASUS motherboard P6T DELUXE.Since the regular use in video encoding is assumed, the increment of the clock frequency is modest.
Since the CPU cooler was changed to a product with good cooling efficiency, the temperature of the CPU did not rise and I felt that there was enough room. However, the compatibility between RAM and the motherboard was bad, so when the clock frequency was increased, it often froze.
The maximum clock frequency that can be used stably is 3717 MHz.
The PC case Antec Nine Hundred used for this personal computer is recommended because it has very good airflow and high expandability.