i see the i7 3770k is stil fast and good would you upgrade a cpu from 3.5ghz to 4ghz the i7 4790k i think its useless to upgrade my old cpu i just could buy all things and keep the cpu right?
If you do not have a special scenario that you need the CPU power do like exodia said and overclock the current one. UserBenchmark: Intel Core i7-3770K vs i7-4790K und Intel Core i7 4790k - Worth the Upgrade? - vs 3770k - YouTube
Nah, it's not worth it. If you're just gaming the 3770k is more than enough power for that. The cost for the CPU+motherboard would be better invested in waiting for the next Intel series CPU