Connectivity

Behind the right side of the panel, the Corsair Xeneon 34WQHD240-C features a pair of rear-facing HDMI 2.1 inputs, a DisplayPort 1.4 input, and a USB-C DP Alt Mode input. The USB-C input provides 5 Gbps of upstream USB data bandwidth, while the HDMI 2.1 inputs offer a full 48 Gbps of bandwidth.


The "main" USB-C port also claims to support 65 W Power Delivery, meaning it can theoretically provide that amount of power to a connected device, such as a smartphone or laptop. To test this, I used a combination of the WITRN C5 USB voltage/current meter - connected directly to the monitor's main USB-C port - and the ATORCH BW150 electronic load with a PD 3.1 trigger module. The two devices were linked using a high-quality ORICO CL32-20 (100 W PD, 20 Gbps) 2-meter USB-C cable.

Under a 20 V/3.25 A load, the monitor delivered a stable 64 W of power through its main USB-C interface, confirming Corsair's claims. The ATORCH BW150 registered around 62 W, with the difference likely due to cable losses. I was able to push the load current to 3.45 A, prompting the monitor to output 67.75 W through its USB-C port while remaining completely stable. At that point, 65.63 W of power was available at the other end of the USB-C cable, further reinforcing my positive impression of Corsair's USB-C implementation.


Behind the left side of the panel, Corsair has integrated an additional USB-C 5 Gbps upstream port along with four USB Type-A 3.2 Gen 1 ports. These can be used to connect peripherals, external drives, and other USB devices, which can then be shared between two computers thanks to the integrated KVM switch. To enable this functionality, one device must be connected via the USB Type-C DP Alt Mode port, while the other should use the USB-C upstream port (for data) along with either an HDMI or DisplayPort connection (for video). The KVM switch implementation is excellent – it's fully automated. As soon as you select the desired video input via the OSD's input selection quick menu, the connected USB devices instantly switch to the appropriate source, requiring no additional steps. That's exactly how a KVM switch should behave.

The aforementioned "secondary" USB-C port also supports USB Power Delivery, and it's rated at 15 W. I was able to push it to 9 V/2 A with no issues, at which point the USB-C port delivered 18.39 W of power (17.42 W on the receiving side). Nice!


Located below the USB Type-A ports is a 3.5-millimeter headphone jack.

Power Consumption

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The Corsair Xeneon 34WQHD240-C gets its power from an integrated power supply. I've used the Meross MSS315 Matter Smart Wi-Fi Plug and the accompanying mobile app to determine the monitor's power consumption at various brightness levels, as well as in Power Saving mode, which it enters as soon as the PC goes to sleep. The results are summarized in the chart below, with all measurements taken after resetting the monitor to factory defaults and with a white background displayed over the entire screen. Interestingly, the Brightness Stabilizer feature, which disables the Auto Brightness Limiter (ABL) and keeps brightness consistent regardless of displayed content, is enabled by default. Most OLED monitors I've tested so far have ABL activated in their factory settings.



The measured power consumption of the Corsair Xeneon 34WQHD240-C is relatively high, especially at maximum brightness, where it can draw up to 85 W from the wall socket. Naturally, if you're using the USB-C ports to charge connected devices, power consumption will increase accordingly. It's important to note that my testing represents a worst-case scenario, with the entire screen displaying a 100% white background. Switching to a dark background would significantly reduce power consumption to around 25 W, regardless of brightness settings, since OLED panels achieve black by turning individual pixels off.