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.
Are you positive about that? I saw some people that actually modded their Freezer 7 Pro by adding another one. Just wanted to confirm it here with someone that tried to do this.
Sure, you could do it, but it would be in the same sense that I could put a fan on my face - it would be difficult and not as effective as you thought it would be.
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