3 days ago I build a pc with some friends which has a GTX 1070 in it and other components that should not hinder the performance of the card. My games play in pretty high FPS, but sometimes it just goes back to 30-50 FPS even in games like CSGO and LoL where it should always be 100+, and it stays on that FPS for quite some time. All the drivers are completely up to date (although I did update them while using an older monitor).
Specs:
RAM: Corsair DDR4 Vengeance LPX 2x8GB 2400 C16
SSD: Samsung 850 EVO 250GB
HDD: Western Digital Blue 1TB
MOBO: Asus PRIME A320MK
CPU: AMD Ryzen 5 1600X
Case: Sharkoon VG4W
Graphics Card: Inno3D Geforce GTX 1070 X2 8GB
PSU: Corsair CX650M
Specs:
RAM: Corsair DDR4 Vengeance LPX 2x8GB 2400 C16
SSD: Samsung 850 EVO 250GB
HDD: Western Digital Blue 1TB
MOBO: Asus PRIME A320MK
CPU: AMD Ryzen 5 1600X
Case: Sharkoon VG4W
Graphics Card: Inno3D Geforce GTX 1070 X2 8GB
PSU: Corsair CX650M