@jf6900  According to the Setup and Specifications document for that system on the Dell Support site, the USB-C port supports DisplayPort 1.4.  I would fully expect you can use the USB-C and HDMI outputs simultaneously, and in fact while you’re correct about HDMI not being able to run multiple displays (other than in mirrored mode), USB-C uses DisplayPort, which means you COULD use that port to run multiple independent displays, using either a daisy chain setup or a USB-C MST hub — so long as the total bandwidth requirements of the displays didn’t exceed the bandwidth available on that port.

thanks buddy. do you know if there is a way to find out what the supported hz of the outputs are on these machines? id like to get it over 60hz for the external monitors!

@jf6900  Docks that rely on DisplayPort Alt Mode, which is the native GPU output(s) wired to USB-C/Thunderbotl ports, shouldn't impose any limitations on refresh rate beyond what the GPU itself can handle and what can be driven using the video bandwidth available to the dock.  A USB-C dock has two DisplayPort HBR2 or HBR3 lanes available, depending on what the system and dock support.  Two lanes is half of a full DisplayPort interface, fyi.  The XPS 13 9300 supports HBR3, but in order to use that, you'd need a dock that also supports it, like the WD19 dock family models.  A Thunderbolt dock would have access to either five HBR3 lanes or eight HBR2 lanes.

If you want to do a bit of math, this page from the WD19 User Guide may be useful.  It notes that each HBR2 lane is 4.3 Gbps and each HBR3 lane is 6.5 Gbps and the provides the bandwidth requirements of some common display resolution and refresh rate combinations.  Even if your specific resolution and refresh rate combination isn't listed, you may be able to figure it out what it would require.  For example, an ultra-wide 3440x1440 display would have 34% more pixels than 2560x1440, and a 120 Hz refresh rate would be twice as much as 60 Hz, etc.

In terms of what the system supports, I know the Intel GPU in that system supports up to 120 Hz refresh rates.  I'm not sure one way or the other if it supports higher refresh rates at any resolution, even if bandwidth wouldn't be a constraint.

The G15 5515 is a Ryzen CPU, and therefore doesn't have thunderbolt.

I have mine connected to a USB- Dock with dual displayport monitors off that. My experience shows that when gaming on the docked monitors, it still uses the RTX 3060 GPU as expected. As a secondary test I get the same FPS readings when using the docked monitor or the laptop screen.

hey mate can you tell me what usb c dock you have? are you running more than 60hz on the screens? Im keen to get it up over 60 hz if possible.

I have a question regarding framerates your are seeing. This laptop does not have a MUX so while on the laptop display exclusively there is a general performance hit as everything goes though the iGPU before getting to the laptop display. Reviewers and users alike have said that using a single usb-c to display port allows for direct dGPU access removing the overhead and getting better performance.

When you say you see same framerates, is it because using the hub or MST/ALT mode type adapters still force it through the iGPU?

I used a stardock.com usb-c dock with triple monitor output and connect that to two DisplayPort monitors.  The usb-c port on the 5515 supports it just fine with no issues.

hey everyone, i just managed to fix the problem by reinstalling the gpu driver while the usb c adapter is connected to the computer, and after the installation was done it worked perfectly, please try it too to see if it fix the problem for everyone

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@jf6900 wrote:

Ok I figured out how to set it up. 

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@jf6900thanks, your answer was helpful. Could you clarify if you were able to extend the screen on two monitors and the Laptop display as well?