Based on the same 12nm TU116 Turing GPU as the GTX 1660 Ti, the GTX 1660 comes with two disabled streaming multiprocessors leaving it with 1408 CUDA cores, 48 ROPs and 88 TMUs. It also comes with 6GB of 8Gbps GDDR5 memory on a 192-bit memory interface. Although many Nvidia AIC partners will have their own versions with higher GPU clock, the reference GTX 1660 works at 1530MHz GPU base and 1785MHz GPU Boost clock, while the memory is usually clocked at 8Gbps (2000MHz).
The GTX 1660 shows Turing's power efficiency at its best, and with a TDP of 120W, you can expect an average power consumption of around 100W. Most cards will need a single 8-pin PCIe power connector which is pretty much overkill, allowing the card to draw up to 225W, which will allow Nvidia AIC partners to pull a bit more MHz on the GPU Boost front.
As to performance, the GTX 1660 6GB fits nicely in Nvidia's latest lineup and, according to Nvidia, should be 15 percent faster than the GTX 1060 6GB model at 1080p resolution. Slower memory and fewer CUDA cores also mean that it is around 10 to 15 percent slower than the Geforce GTX 1660 Ti but still packs enough punch to be faster than the Radeon RX 590, at least in some games.
At $219, Nvidia is clearly going for the AMD's Radeon RX 590, usually priced at around $240. In Europe, the GTX 1660 should go for around €190 excl. tax, which is around €220-230, depending on the region. In the UK, the price will start at £199 . The GTX 1660 6GB is likely to offer plenty of performance per buck/euro or pound in the mid-range market, and it looks like a great graphics card for gaming at 1080p resolution.
There are plenty of reviews around and you can check out some of them below.