Will an i5 3570k throttle a gtx titan?
No - if you were SLIing the Titan, the 3570k would be a bottleneck, but otherwise, it should be fine. If you are worried, just get a 3820 and a 2011 motherboard, instead.
i cant its a mini itx build.
Oh, in that case, a 3570k or 3770k will be perfectly fine with a Titan, even in extreme OC cases.
sweet thanks :)