Specialized Tarmac Pro

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I'm looking to get a 2008 specialized tarmac pro, and I'm a bit worried about stiffness in this frame though - is this likely to be stiffer than an aluminum CAAD9 frame? About the same?

I'm not really okay with sacrificing stiffness for a carbon ride, but I don't really notice stiffness too much unless I'm racing, which I can't really do on a test ride.

Thoughts?