use the one that came with the TRUE. in benchmarks thermalright's chill factor 2 (which comes with the TRUE) benches lower temps than AS5. hell, the 2 old ass tubes of chill factor 1 i got with my 2 IFX chipset coolers yesterday bench about the same without even mixing them, which they both could use. alternatively, AS5 will still do a good job, but the chill factor is an exceptional paste. with my friend's i7 + lapped TRUE he gets 55c load at 3.7ghz @ 1.36vcore under OCCT linX v3.
the thing to consider is that the base on the TRUE is HORRIBLE with the factory job. if you are looking for something to just slap on and fire up i wouldnt recommend the TRUE. factory lapped it performs more in the ballpark of a $35-45 cooler instead of the $60-75 i see it selling for most places. if you are planning o spending that much i would highly recommend looking for a place that has the prolimatech megahalems in stock. the cooler performs "on par" with the TRUE (within .5c in most tests), and the mounting mechanism on it is the best one on the market you can get, bar milling your own mechanism yourself specifically for your cooler. i have seen the performance of the TRUE, and while it's insane, the thing was also a BITCH to mount onto my buddies i7. had to remove the CPU latch bracket so the backplate for it would fit, since all i7 chip holders use a backplate, and the bolts didnt reach all the way through to the mounting points with it on.
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