Massimilliano from the MemoryExtreme Team Italy has an eye on the CPU temperature, which is extremely important. Cooling the processor down too much might result in a so-called cold bug, which causes the CPU to literally freeze, and it will stop working for a while. As you'd be losing time, you want to avoid this.

Core i7 is much more sensitive than Core 2 it seems, so a 20°C temperature difference might be outside of the ideal temperature operating range. According to various teams, the ideal operating range is at around -95°C and -100°C.