Re: intel i5 4670
Well you'd need to replace your mobo as well in order to use the 4670, so if you're 100% replacing your CPU then go with the FX8350. It's a badass CPU anyway and will kill any rendering/editing/gaming you might be planning on doing. the 990FX is still the best AMD chipset you can currently get.
most 8350 chips will overclock to 4.5/4.8GHz as well, and you've got a decent UEFI BIOS OC'ing motherboard there too.
EVGA SLI Micro Z68 // Intel i5-2500k // 8GB Corsair Vengeance 1866MHz // Overclocked 2GB MSI R9 270X // Corsair Carbide SPEC-03 // Kingston Hyper-X 120GB // 2TB WD Green + 500GB WD Black