4.5ghz is the max turbo speed for that cpu. That's not an overclock, if its not throttling down after its done booting, some of the power states might be disabled. Is the motherboard running the latest bios? (1301?)
It will work. Will at work at 3000mhz when you enable xmp? maybe. If you want a list of ram kits that your specific motherboard supports, check out their qvl on their website.