cooling the memory will decrease the rate of ram degrading over time but still they might degrade with 2.2V and fan on them or survive with 2.4V with no cooling ,,,, nothing guaranteed when it comes to OC but you got better chances with a cooling fan
i will try to be more clear next time
i think i have read that somewhere here in xtreme bandwidth and that might be the reason for cheap HZ lately ,,, i didn't expect it to get lower than the 200$ mark