Slightly OT but try some Diamond 7..
New and we're testing it.
Beat's the crap out of AS5 and thats been my TIM for years.
http://www.petrastechshop.com/icdi7cathco.html
My results:
Q6600@3600
Air cooled, 68-70F room
100% load
AS5: 49-48-48-47
D7: 45-45-45-44
That's after 6 days but was showing me that within 1c from the time I fired it up..Nice stuff!