![]() But that's only been done for some of the low power 15W CPUs used in systems like the XPS 13. They did it for "Ice Lake" CPUs found in the XPS 13, and part of that new architecture is a new GPU that supports DP 1.4. Intel has had a lot of trouble moving to a new 10nm architecture. The reason only DP 1.2 is supported is partly Intel, and partly Dell. They shouldn't have had to do that since in theory both adapters should have worked fine with all sources, but not everything in the tech world that SHOULD work always DOES work, and apparently that's the case with some USB-C to HDMI If Dell wanted to provide adapters to allow USB 3.0 and 4K 60 Hz from that system, they would have needed to be on separate adapters. I've helped multiple people here who had USB-C to HDMI adapters that didn't work with certain systems even though the adapter worked fine on other device, and the fix was to just try another brand of adapter. That adds complexity, which increases the chance of issues. USB-C to HDMI cables/adapters need to incorporate an active converter chip to switch that DisplayPort signal to HDMI. A USB-C to HDMI 2.0 cable would also work when connected directly to the system, although if your display has a DisplayPort input, I'd use USB-C to DisplayPort instead simply because USB-C ports send native DisplayPort anyway. That's been achievable on systems for several years, including lower end XPS 13 models. But running USB 3.x data requires two lanes, so when a device sets up a link for video and USB 3.x, video bandwidth gets cut in half - and thus you only get 4K 30 Hz (or 1440p 60 Hz).īut if you were to get a USB-C to DisplayPort cable and connect it directly to the system output, then yes you'd get 4K 60 Hz. The supports DisplayPort 1.2 over USB-C, not 1.4, which means for 4K 60 Hz you need that full interface. ![]() When all four are allocated to video, you get a full DisplayPort interface worth of bandwidth. They shouldn't have had to do that since in theory both adapters should have worked fine with all sources, but not everything in the tech world that SHOULD work always DOES work, and apparently that's the case with some USB-C to HDMI The issue with the HooToo adapter is that multi-purpose USB-C hubs like that need to set up the USB-C link to carry both video and USB 3.x. So it's possible that the adapter technically does support 4K 60 Hz and USB 3.x simultaneously.but not when used with a DisplayPort 1.2 system like the XPS 15 9500.īut if you were to get a USB-C to DisplayPort cable and connect it directly to the system output, then yes you'd get 4K 60 Hz. In THAT case, even a half bandwidth link is enough for 4K 60 Hz, in which case that adapter can be used for 4K 60 Hz and USB 3.x simultaneously. ![]() So I suspect what's happening in that case is that the adapter supports systems that can run DisplayPort 1.4 over USB-C. The adapter that came with the XPS 15 I believe supports HDMI 2.0, but also supports USB 3.x. But running USB 3.x data requires two lanes, so when a device sets up a link for video and USB 3.x, video bandwidth gets cut in half - and thus you only get 4K 30 Hz (or 1440p 60 Hz). The issue with the HooToo adapter is that multi-purpose USB-C hubs like that need to set up the USB-C link to carry both video and USB 3.x.
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