Try using Dolphin 3.0 or 4.0.2 x86 (stable version) and update your driver. I'm using Nvidia too, and I never experience this kind of problem.
Asus ROG Strix GL553VD | Windows 10 Home 64-Bit | Intel Core i5-7300HQ 2.50 GHz | NVIDIA GeForce GTX 1050 4GB VRAM | 8GB DDR4 RAM | 1000 GB HDD + 128 GB SSD |
