It would hardly get a 10% increase but the 880k is $85. The only one with faster stock speed is 7890k but that's $150 just for a .1ghz increase and an igpu you wouldn't use. You could always oc a lower end 860k to the same speeds. Or just oc what you have since it's such a small increase to be spending the money. I'd suggest looking at replacing more than just the cpu. Maybe wait for the lower end ryzen to release.