HC stands for hydrocopper and are components with waterblocks pre-installed at the EVGA factory. The acronym FTW stands for "For the win". FTW model graphics cards are the highest overclocked card available. Each card is hand tested and gauranteed stable at the advertised clock speeds.

The term "DT" on an EVGA graphics card, such as the EVGA GeForce GTX 1060 FTW+ DT, stands for DeTuned. This means the card was manufactured with the features of a higher-tier model like the FTW (For The Win), but it was not stable at the higher clock speeds that the FTW model was designed for.
In essence, a "DT" card is a card that has the same hardware as a standard FTW model but has been set back to reference clock speeds due to stability issues at higher frequencies.
Specs of EVGA GeForce GTX 1060 FTW DT:
Based on the information available, the EVGA GeForce GTX 1060 FTW DT would generally have the following specifications, though some details might vary slightly depending on the specific model variant:
    •    GPU Architecture: Pascal
    •    CUDA Cores: 1280
    •    Memory: 6GB GDDR5
    •    Memory Bit Width: 192 Bit
    •    Memory Clock: 8008 MHz Effective
    •    Base Clock: 1506 MHz (This is the "detuned" aspect, as regular FTW cards would have higher base clocks)
    •    Boost Clock: 1708 MHz (Similarly, this is the "detuned" aspect)
    •    Memory Bandwidth: 192.2 GB/s
    •    Bus Type: PCIe 3.0
    •    Outputs: 1 x Dual-Link DVI-D, 1 x HDMI 2.0b, 3 x DisplayPort 1.4
    •    TDP: 120W
    •    Cooling: Likely featuring EVGA's ACX 3.0 cooling technology
In summary, the "DT" designation on an EVGA 1060 FTW card indicates that it is a detuned version of the regular FTW model, with the same hardware but running at reference clock speeds due to stability considerations during manufacturing testing.