It really depends on your case. It could be 3-4 or more. All the hot air is rising to the top of your case and creating hot air packets on the top. Do you have a fan on the top of your case?
holsky you should tell me how it works man, im looking for a cooler for my kuma 7750, my temps are getting to 67C after 3-4 hours of HAWX. im probably gonna have to clock down