Users have problems with RTX 3080 in combination with OLED TVs from LG - Computer - News

Users who combine a GeForce RTX 3080 via HDMI 2.1 with LG OLED TVs from 2019 and 2020 run into problems. Nvidia’s G-Sync implementation of variable refresh rate does not work and CX models switch to 4: 2: 2 subsampling at 4k120Hz.

The use of the G-Sync Compatible function on the RTX 3080 video card in combination with LG OLED TVs results in a black image. This can be seen in a YouTube-video van Tech YES City. Also users on reddit report similar problems. The relevant LG TVs, such as those from the C9 and CX series, are advertised as G-Sync Compatible. That’s Nvidia’s name for the implementation of the HDMI 2.1 feature variable refresh rate. AMD calls this FreeSync.

With the LG CX-OLED TVs, this year’s models, gamers are unable to get 4k120Hz in the picture with 4: 4: 4 display without compression. The TVs will automatically switch to 4: 2: 2 sub-sampling. HDMI 2.1 in particular makes playback at that resolution and frame rate possible without compression, but with CX TVs this is currently not possible, according to users. Also on the Nvidia forum users report that.

With LG C9 TVs from last year, users are able to display 4k120Hz with 4: 4: 4 color coding. Those TVs have an HDMI 2.1 connection with a bandwidth of 48Gbit / s, while the CX TVs have a 40Gbit / s connection. However, that shouldn’t make the difference. Also the lower bandwidth of the CX models is enough to display 4k120Hz 4: 4: 4 at 10bit color depth. Additionally, users report that the TVs also switch to 4: 2: 2 when using an 8bit color depth, requiring even less bandwidth.

Twitter user Sixi82 shows the difference in picture quality between 4: 4: 4 and 4: 2: 2 and also said to have tested several HDMI cables to rule out that they are causing the problems. The problems with firmware and driver updates can probably be solved. LG and Nvidia have not yet commented on the users’ findings.