2080 rtx is the new king. I don't touch low class stuff like the 1660 ti. Compare mining specs on grin.
If you are interested in a multi year payback time sure.
You would have to be an absolute fool to spend money on RTX cards for mining at this point....
oh really lets see here.
https://www.reddit.com/r/gpumining/comments/avyaq1/gtx_1660_ti_mining_performance/MTP-Zcoin (CryptoDredge 0.17) 1.84 Mhs Core +80 / Mem +600 Powerlimit 75 Intensity 6 90 Watts
My 2080 rtx gets double that at 3.6 mhz core +125/ Mem +175 Power limit 65 . 150 Watts.
That means you would have to buy two of these gtx 1660 ti to match a 2080 rtx performance and your using up more energy in the process at 180 watts total vs 150watts. In this multi year bear/accumulation game its all about efficiency because your just 1 watt away from getting liquidated, and this proves the 2080 rtx is more efficient and worth paying a little bit more for. I've seen 2080 rtx on sale for $660 last week on B&H. You get the extra rtx cores for gaming, better resale value, more future proof, more dense rig setup and more energy efficiency.
Most miners care about daily profits on whattomine and have fast they can break even and be stuck with junk hardware. These are your typical home hobbist miners that will never be able to expand and always be small timers
I think two steps ahead and focus on whats going to get me the maximum amount of money in a few years of mining and not selling a single coin till we hit next parabolic bull cycle. I always pick out my gpu's based on a rig setup that will allow me to mine the most popular new coins like grin and beam early before asics hit them and I pick hardware that has most efficiency for the long game so i don't get gpu liquidated.