For transparency the textures need to be save in DXT5 format, and the transparent parts have to be the last parts modelled or separate parts, DXT5 formats differs from the DXT3 format in the way the alpha information is saved, so allows for better processing of transparency.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
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i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.