While I think the > $310 GTX 1660 Ti cards are kind of crazy, it's wrong to say that it isn't a performance improvement over the GTX 1060 6GB.
1. Turing can do float + int operation at the same time, we see large gains from that in some titles
2. GDDR6 = more memory bandwidth than GTX 1070 even out of the box
3. performance is at least 20% in any title due to the CUDA core increase , before any Turing improvements
4. any FP16 operations are much faster due to FP16 cores, this will show in any title using it
5. The power consumption is inline with GTX 1060 6GB despite these performance gains, TPU has this as the highest performance per watt
It's a win in performance, it's a win in efficiency. What isn't
there is the launch pricing for the cheaper no-frills base models. The non-EVGA partner cards are marked up unless you want a dingy ASUS phoenix (hilariously bad) , MSI Ventus (single heatpipe and plastic backplate, way to go there ... also unlike prior generations it's loud per TechPowerUp) , Gigabyte OC (this isn't helping them with 1 heatpipe , selling point seems to be 3x DisplayPorts) , Zotac (horrible power delivery components with a tacked on better heatsink to compensate for that) , Inno3d (not stellar heatsink), Palit StormX (the 2 slot single fan cooler is likely undersized even though it has 3 heatpipes) , Gainward (should be mediocre), Colorful (it's a triple fan massive card for a 120W TDP GPU), PNY (it's a horrible place to buy it but the card itself is mediocre at best). It's almost as if the base models are up-sells for the more expensive ones that are close to RTX 2060 FE pricing.
For $40 you can get yourself an Arctic Accelero Twin Turbo which will embarrass all these aftermarket coolers so there really
shouldn't be any card more than $310. At $330 for the STRIX or Aorus, you can just save yourself $20 more and get a RTX 2060 Founder's Edition which will have similar 6 phase power delivery but outright better performance (and VR-Link) due to 25% more CUDA cores even when lowering power limit. The value proposition isn't there when a base model XC Black can hit 2041MHz in TPU's review which matches the MSI Gaming X within margin of a few MHz. Given a 6mm heatpipe is capable of dissipating 40W given a supporting fin stack and 8mm is capable of 60W or so , I would think that there should be at least 2-3 heatpipes with a fin stack to match it to fully heatspread and dissipate the 120W TDP.
If EVGA can fix their fan curve and add zero dB mode their single fan XC Black is a solid choice. An optional backplate would have been nice but the RTX 2060 doesn't have one either ; power limit could be unlocked a bit but competing cards are only limited to 120W-130W anyway.
edit: GTX 1660 Ti Tech briefing https://www.techarp.com/computer/nvi...e-gtx-1660-ti/
* no DLSS (due to lack of tensor cores) , and obviously no RTX