Ive just bought an asrock z68 pro3 gen3 mobo with 16gb of 1600mhz ram with 2x128 samsung 830 raid0, gainward gtx 550 ti gs. shall i buy a i5 2500k or i5 3750k? ive heard that its a bit of a ball ache to update bios for IB. Also will i be able to get 1700mhz on xmp profile?