3DMark Time Spy
Rendered at QHD or UHD resolutions and making use of DX12 technologies such as asynchronous compute, explicit multi-adapter and multi-threading, Time Spy is a modern 3DMark benchmark that hints at GPU potential in today's latest games.
Going by the 3DMark results, there is no meaningful performance penalty for choosing a smaller, more compact GTX 1660. Palit's StormX OC is practical identical to the larger EVGA XC Ultra.