use 2500k stock fan TIM?

[Gti]

I'm building right now and wondering wheather to use the TIM thats already on the stock fan or slap on some Arctic 5 i have laying around, is the difference going to be that big? i only plan on going to 4.2ghz so not expecting to work it really hard

 

[Philtor]

Your not going to see a great difference if your using the stock cooler but you might as well use the better quality paste since you have it sitting

 

[scrlk]

If I'm right, Intel use Shin-Etsu TIM on stock coolers, which IMO is better than AS5.