Monoprice 3-Feet 28AWG High Speed HDMI to Adapter DVI Cable with Ferrite Cores - Black (109363) This HDMI to DVI Adapter Cable is capable of video performance equivalent to a High Speed HDMI Cable Ferrite Cores are small magnetic blocks wrapped around the end of a cable They are used to suppress EMI/RFI electronic noise on the cable by absorbing the unwanted high frequencies and dissipating them as very low-level heat