Hugely dependent on workload, as far as I'm concerned.
For gaming, if serious about such things, I would look towards what resolution and refresh rate the monitor has. Even then we'd be looking whether the CPU can produce the frames necessary, and then the GPU fill in those frames. The GTX 1660 series goes from 1080p to 1440p, it seems. So those cards should do a solid job.
However... all this is a different question to what began this thread. What is the purpose of the question and what do you seek to use the information for? If it's the purchase of a new graphics card, then just state it. Let people know what hardware specs you have, and the games you play and will likely play; this would give you a better answer rather than the current academic approach to a theoretical question about the viability or trustworthiness of a particular website.