2. Intel 3.4GHz Core i5-3570K
Another Ivy Bridge Core i5 model that's still going strong, the quad-core 3570K model features a standard 3.4GHz clock speed with a 3.8GHz Turbo Boost speed plus an unlocked multiplier for overclocking. The chip also comes with 6 MB of Intel Smart Cache and Intel HD Graphics 4000. Even though it was released in the second quarter of 2012 for an MSRP of $235, the Core i5-3570K is still one of the best-selling x86 processors around.