Maybe. Please provide all specs for this system. Include all installed devices (include makes/models), be sure to include the info for your Heatsink/Fan (HSF).
4.5Ghz may be a little ambitious, but you should be able to improve over the stock speeds with little effort.
I have 4 gb ram 1333 GHz, 430 gt nvidia video card 128bit, 500 GB Western Digital 1024 ddr3.hdd, Energon power 550 W, 3.3 GHz processor i5 2500K, 6 MB L3 Chacha, MB MSI-C45 p67a b3. Thank you!
I am not familiar with your power supply, but everything else looks ok. Try OCing in baby steps. Go slow and check stability along the way. When you go too far, you will know it. Then just back off to a safe level. Watch your temps throughout the process as well.