This error happens after every AA sample change.
System specs:
Core i5-8600k@5,1Ghz
48GB DDR4
ASUS TUF Z370 Plus Gaming
2x GTX 1060 6GB ASUS Dual (dual gpu crash fixed with the last update)
Studio Driver 460.89
WIN10 Pro 20H2 / 19042.685 (fresh install)
Maya 2020:4 / MToA 4.1.1.1 / Arnold Core 6.1.0.1
Error code is:
// Error: [gpu] an error happened during GPU context setup : Unknown error (Details: Function "_rtContextSetDevices" caught exception: Assertion failed: "entry->isBuffer && entry->resource.samplers.empty()", file: <internal>, line: 115) //
setAttr "defaultArnoldRenderOptions.AASamples" 3;
// Error: [gpu] Fatal GPU error occurred, please restart the host application //
If you need any other logs let me know. Help greatly appreciated!
EDIT: Im an idiot. This happens when you run out of VRAM. Take this as the question answered. Im going to keep this up for other people like me.