I recently upgraded and I'm still using the stock CPU fan - which isn't great. What's a good alternative that's relatively cheap? When I had my C2D I used the original Arctic Cooling Freezer 7 Pro which did a pretty good job. Not the best, I know, but it could handle a bit of an overclock. I was looking at getting around 3.6GHz from this 920 - would the ACF7 suffice? Or do I need something a bit better?