Quote:
Originally posted by UnaClocker
Yes, they are aluminum, and yes they don't cool worth a damn.
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The thing to remember is
small heat loads! 
I've got a 4x6 one on a T-Bird; hopelessly under cooled (even though the damn thing's more stable at 10x 150 than 10.5x 133!). I was using it on a 900 Duron; cooled okay, but nothing to get really excited about. When my BIX arrives, I'm gonna put the 4x6 on the K6-3 it was bought for over a year ago!
Come to think of it, a 4x4 or 4x6 would probably be great for cooling a chipset/GPU loop seperate from the CPU.
Unless you
really need a tiny rad, for another $20 over the cost of a 4x4 you can get a BI Prime which will handle almost anything you can throw at it.