Nope, you can only use one fan on it, and that one fan is the stock 120mm that comes on it. The reason for this is because the stock fan uses a special mounting system. I'm pretty sure you won't be able to remove just the fan itself and put a new one in.
As far as I'm concerned the stock fan that comes with the heatsink is really nice. It's a nice cooler, just not for anything over a dual core.
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