Intel 4670K i5 Haswell Review & Overclocking
Now we're finally free of the tests that only care about the amount of cores available, you can see that the Core i5-4670K has plenty of grunt for 99% of the tasks that you'll require it to perform. Whether it's the older PC Mark Vantage, or the much newer PC Mark 7, the Core i5-4670K is easily a match for the pricier i7-4770K, and certainly wont be the limiting factor in your setup.
PC Mark Vantage
PC Mark 7