The answear to that would be yes you can overclock and yes you will always be able to hit the max turbo mode.
Do how far the cpu overclocks u have to find out,
I my self have had i7's wich would do 5ghz and had some wich where stuck on lets say 4.4ghz.
So getting a 3570 will not asure you that it will hit 4.5ghz
Also keep in mind that all warrenty is gone when u overclock!
And its not all about the cpu other parts like
Mainboards, Memmory, cooling all have a hand in how far your cpu overclocks.
Hope this helps you.
Thats where your wrong Nipo,
It does alow you to go as high as the turbo multiplier will go wich is if i dont mistake 39x wich would kick your cpu to 3.9ghz.
And besides that it does alow you to play with the blck, most cpu's can do a 105 base clock wich would bring the cpu ip to 4.1 ghz
What i think Nipo is trying to say is basicly no u cant overclock like with a Z chip set push the multiplier to like 45x and run that way @ 4.5ghz.
In that case yes thats true.
but stil you could overclokc it a bit true the above mentiont methode.