Replacing my CPU, should i replace my fan too?

Double post

That heatsink is HORRIBLE. (original one)

Just keep that one if it still works.

If it works that it is perfectly fine! However, when changing cpu's or whenever you take your heatsink off, ALWAYS re-apply thermal paste!

The old Zalman coppers where good heatsink and did a good job of cooling P4's, for a C2Q might be pushing it. Spend £25 and get yourself a Hyper 212 Evo and keep you Q9450 nice and cool, will also give you thermal headroom for overclocking.

certaily upgrade the heatsync but not with that or any other saucer hsf... for a core 2 quad you could use 1 of zalmans other 9 series. like the 9500a, 9700, or what ever you fancy... but stay away from the saucer shaped 1s as they dont do a very good job 1s your temps start climbing...
you can pick up a 9500a for as little as £25 if you look about.. and they run silent. well at least the 1 i had on my old amd did... you cant really say the same for the hyper 212... even if its a quid cheaper...