compare 2 systems

[Fallout32008]

I have 2 builds.

1.
asus z170-ar motherboard
i5-6500 cpu
16gb Kingston hyper X ddr4 @ 2133mhz
2x crucial m500 120gb ssd's
EVGA GTX 980 Ti Kingpin
Seasonic ss-860xp2 80 plus platinum

2.
gigabyte z97mx-Gaming5 motherboard
i7-4790k cpu
16gb Corsair vengeance pro @ 1600mhz
EVGA GTX 1080 SC
EVGA supernova 650 p2 80 plus platinum

Question is, how should these be consolidated into one and configured for best performance?
i5-6500 and ddr4 are newer, but i7-4790k is much faster. 980 Ti kingpin is better for graphics but 1080 sc is better for gaming. Just need some opinions...

 

[CountMike]

I would swap GPU into first one and keep it, second one is dead end but first one could be readily upgraded.