is an Intel® Core™2 Duo Processor T6600 at 2.9 GHZ enough for full speed?

[Atemus]

is an Intel® Core™2 Duo Processor T6600 at 2.9 GHZ enough for full speed?
or at least near full speed using geforce9500?

or even near full speed.
i heard the you tube user named nosound use one of these and he is also on this forum but his account got suspended on you tube so I can't be sure what he have but as i saw on his video he had Full Speed on the games he played.

games i am looking fore ward to play are 'Sonic and the black knight' and 'Sonic Unleashed' if you want to look at the game play for Rating what the games need here is a video : http://www.youtube.com/watch?v=NjNfx11XPkk
its more based on Speed

I Run intel Pentium DUAL Core at 3 GHZ and the sound is Way way Too Laggy and the FPS aren't all of that they can be Very Very Slow almost unplayable and unenjoyable in sonic Unleashed

and in sonic the black knight Rendering goes really Slow at 50% of the stages and the other 50% the sound is not perfect.

Basically i would like Full Non-Laggy Sound at least
I am planing to Run:

Intel CoreT660 at 2.9 GHZ + Geforce9500
32 Bit - Windows 7 Ultimate

Would that give me full speed?
i have the processor "T" and now using "P" i can replace both processors in both computers.

EDIT: I have 4 GB Of Ram btw