Just got a core2duo E4400 retail. The retail box came with the processor and the HSF. The part of the HSF that makes contact with the CPU looks like it has some preapplied paste in groove form(first time building a comp with an intel cpu). Should I still use the thermal paste I have on the cpu in addition to what's on the intel HSF or should I just put the hsf on the cpu in the motherboard and lock it without applying my own paste? Thanks in advance.