I have a Phenom II 955 and am looking for a fan and cooler but do not want to take the motherboard off. I see Cooler master Hyper TX3 and Arctic Cooling 7 are two that can be installed without motherboard removal. The problem is I do not have a top fan on my case and am concerned that the exhaust from the cpu fan can only be directed to the top or bottom of my case. How much will this affect its efficiency. Is it worth getting without having a top case fan? Are there any similar that can send the exhaust to the rear of my case for better air flow. Thanks for any ideas or suggestions.