Inspiron 5515, S2721QS only 4K 30Hz available

@scott_wu  The Inspiron 5515 documents, Setup and Specifications PDF for that system available on the Dell Support site says that it has an HDMI 1.4 port, which only supports up to QHD 60 Hz or 4K 30 Hz. You’d need an HDMI 2.0 port for 4K 60 Hz. However, that system also has a USB-C port that supports DisplayPort video output, and since the earliest DisplayPort revision supported over USB-C was 1.2, which supports 4K 60 Hz, that’s your answer. I’d suggest getting a USB-C to DisplayPort cable.  If your display’s DisplayPort input is already occupied by something else that needs it, then you could instead get a USB-C to HDMI 2.0 cable, which would have a built-in converter chip to switch the USB-C port’s native DP signal over to HDMI, and you’d still have 4K 60 Hz because the source port and the converter chip in the cable would both support 4K 60 Hz as long as the cable is rated specifically for HDMI 2.0.  But the reason I recommend DP if possible is because it’s simpler. You avoid the converter chip, and those sometimes cause problems. I’ve seen multiple cases where USB-C to HDMI adapters/cables only worked with one system and not another even though it should have worked with both, and in those cases the answer was just to try another brand of cable. That shouldn’t have been necessary, but not everything that should work in tech always does, so I prefer to keep it simpler when possible.

Hi there,

The USB Type-C to DP cable works. I got 4K 60Hz available now.

Thanks a lot.