Long story short, I recently invested into a new GPU. GTX 980 Ti, this was a big step for me considering my current build is somewhat bad.
Here is my current build.
Now my question is, I need a new CPU and motherboard. Which should I get?
I come up with this:
CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Motherboard: Gigabyte GA-Z170XP-SLI ATX LGA1151 Motherboard
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2133 Memory
But people are telling me to get an i7? I don't know much about computers, but whats the difference from an i5 and i7?
Here is my current build.

Now my question is, I need a new CPU and motherboard. Which should I get?
I come up with this:
CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Motherboard: Gigabyte GA-Z170XP-SLI ATX LGA1151 Motherboard
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2133 Memory
But people are telling me to get an i7? I don't know much about computers, but whats the difference from an i5 and i7?