So how come they have recommended settings 2.4Ghz. Are they implying duo?
The game was released on October 2007. 2.4GHz at that time meant E6600 or X2 4800+. I don't have benchmarks for TF2 but look at these for Prey:http://www23.tomshardware.com/cpu_2007.html?modelx=33&model1=918&model2=877&chart=425
Your 3 GHz Pentium 4 is around 46 fps there, while the E6600 and X2 4800+ are at 109 and 94.