The purpose of using quantum dot technology is to expand color gamut of the display by increasing intensity of red and green wavelengths (you can read more here). Samsung confirms that in the case of the CFG70, quantum dots help to produce more accurate dark reds and greens, which increases the contrast. In addition, Samsung says that the use of quantum dot technology for the backlighting of the CFG70 has allowed the company to expand the color gamut to 125% of the sRGB color space.
However despite the monitors' larger-than-sRGB gamut, at this point Samsung is only confirming that the monitors' firmware supports the sRGB color space, listing nothing about the AdobeRGB or DCI-P3 color spaces. This is an important consideration due to the fact that it potentially limits the usefulness of having a color gamut over 100% of sRGB to begin with. With most monitor designs, manufacturers who offer larger gamuts also support color spaces that can use that gamut, which doesn't appear to be the case for Samsung.
The catch then is that having a gamut that exceeds a particular standard will not produce an accurate result when using that wider gamut. Case in point, sRGB content would end up oversaturated since it's meant for a smaller gamut, and the lack of support for larger color spaces makes it difficult to use the wider gamut with anything else. It is hard to believe that Samsung decided to develop a set of monitors that would produce incorrect colors out-of-the-box, so hopefully Samsung is offering a true 100% sRGB mode as well. This would negate the wider gamut of the monitors, but it would ensure their accuracy.
