These cards are definately bottlenecked with a 3Ghz cpu. I can understand why reviewers do it (so mainstream users can get an idea of the performance they can expect from these cards) but for us power users its annoying for us to not see the true power of these cards unleashed! I mean for example with the setup in my sig, I am getting better vantage scores than some reviewers are getting with 4870x2 Xfire! One thing I have noticed is that these cards do scale well with more cpu mhz and they love high fsb. I am just trying to work out whether to trade in both my 4870's for a x2 or whether its not really worth it.... hmmm