The AV.io 4k will indeed scale in hardware to whatever resolution is requested by the application. Though it is possible that in this case the application is doing the scaling itself? I do not know though. At the very least I would recommend making sure you have the latest firmware version running, as the scaling quality was improved compared to older firmware versions. You can download the current firmware (version 4.0.0) and the tool to upload it on the Software tab of this page: https://www.epiphan.com/products/avio-4k/resources/