Pros: Very small, two of them will fit in a dual Socket C32 configuration on my motherboard.

Cons: It's much worse than the Noctua fans (CPU runs on average 15 C higher), but much much, smaller, so it will do. Typically the CPU runs at 60 C now.

Other Thoughts: There is no information on airflow direction. For future purchasers, intake is on the fan side (that is, point the NON-fan side towards the back of your case as that the outtake direction is the aluminum side).

Pros: It works like a charm. Fits in a 2U case.

Cons: Doesn't seem to indicate which direction airflow is. I had to install, realize it was the wrong direction and reverse it.

Pros: Ok, this is the first Dynatron that seems capable of keeping the AMD C32 Opteron 4334 cool. No overheating. It's nice as I can use it in a 2U case.

Cons: Nothing so far.