Apparently you can overclock the GTX 1660 Ti VRAM an extra 1000MHz and it's perfectly stable. I've played FarCry 5, COD BO3, and Minecraft with SEUS PTGI all for a few ours
NVIDIA GeForce GTX 1660 SUPER Specs | TechPowerUp GPU Database
MSI GeForce GTX 1660 Super Gaming Graphics Card, PCI-E x16, No NVLink, VR Ready
GeForce GTX 1660 Available Now: Turing Tech and Performance Starting At $219 | GeForce News | NVIDIA
The NVIDIA GeForce GTX 1660 Review, Feat. EVGA XC GAMING: Turing Stakes Its Claim at $219