NVIDIA has just shown us one of the most ingenious ways of creating new custom, competitive SKUs for the midrange market without spending any additional amounts of money on R&D, wiring, or memory controller work: just reuse the chips that already have that work done. This is the case for NVIDIA's new GTX 1060 GDDR5X graphics card, which the company has "designed" to further fill in the gaps on its midrange offerings against a revamped Radeon RX 590.
Instead of reworking a purpose-built memory controller solution compatible with the GP106 GPU, the company has gone and carved the SKU from its existing GP104 silicon - which already supports the GDDR5X memory subsystem due to its implementation on the GTX 1080 (GP104) and 1080 Ti (GP102) graphics cards. A smart usage of GP104 inventories - which have been superseded by NVIDIA's new RTX 20-series in the high end - or of very defective dies (remember the GTX 1060 has half the shaders, at 1280, compared to the GTX 1080's 2560). This decision by NVIDIA could also go some way in explaining dwindling inventories and increasing pricing of GTX 1080 graphics cards, as chips that could have been used for that SKU are (possibly) being used for the new GTX 1060.
The discovery came courtesy of a teardown on iGame's GTX 1060 U-TOP V2, which features a triple-fan cooling solution, 2x 8-pin power connectors, and an 8+2 phase power delivery design, via Taobao. Apparently, even the SLI fingers remain on the card, which if you'll remember, never where supported on NVIDIA's GTX 1060 - a result of iGame's decision to simply reuse their PCB design for the usually much more powerful, GP104-based GTX 1080.