I didn't play any games for the last 2 weeks because I was mining ETH using Claymore Miner (XFX RX 580 also hooked up via Riser Cable). I bought H1Z1 Yesterday and I was getting 20-40 FPS and also my CPU Usage at 100% and my GPU at 20-40%. I tried to lower all the settings down as I can, it didnt chage any thing I thought it might just be a bad optimization. Then I tried playing Witcher 3 (I used to get 65 FPS @ 1440p at almost maxed) I got 30-40 FPS @ 1440p at same settings my CPU Usage at 100% and my GPU at 60-80%, lowered all the settings down same thing it didn't changed. I also tried Heaven and Valley benchmark @1440p and @1080p it was fine. I also uninstalled and installed Nvidia Drivers.
PC Specs:
CPU: i5-6600k 4.3 Ghz
Cooler: Cooler Master T4
GPU: Asus Strix 1070 Non OC Edition
RAM: Crucial Ballistix Sport LT 8GB
MOBO: Asus Z170 Pro Gaming
PSU: EVGA 750 G2
Monitor: Asus MG279Q
PC Specs:
CPU: i5-6600k 4.3 Ghz
Cooler: Cooler Master T4
GPU: Asus Strix 1070 Non OC Edition
RAM: Crucial Ballistix Sport LT 8GB
MOBO: Asus Z170 Pro Gaming
PSU: EVGA 750 G2
Monitor: Asus MG279Q