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
GeForce® GTX 1660 Ti GAMING OC 6G Key Features | Graphics Card - GIGABYTE Global
Introducing GTX 1660 Ti: The Perfect 1080p Upgrade
GIGABYTE GeForce GTX 1660 Ti OC 6G Graphics Card, 2 x WINDFORCE Fans, 6GB 192-Bit GDDR6, GV-N166TOC-6GD Video Card - Newegg.com
GeForce® GTX 1660 Ti GAMING OC 6G Key Features | Graphics Card - GIGABYTE Global
Amazon.com: MSI Gaming GeForce GTX 1660 Ti 192-bit HDMI/DP 6GB GDRR6 HDCP Support DirectX 12 Dual Fan VR Ready OC Graphics Card (GTX 1660 TI GAMING X 6G) : Electronics
Introducing GTX 1660 Ti: The Perfect 1080p Upgrade
GeForce GTX 1660 Ti Mega Benchmark | TechSpot
GeForce 16 series - Wikipedia
GeForce GTX 1660 Ti Roundup | GeForce News | NVIDIA