Samsung recently launched its new Odyssey Neo G9 display. It’s a high-resolution display: 7680 x 2160, i.e. double UHD, all at 240 Hz. However, if you have an NVIDIA RTX 40, you won’t be able to enjoy this resolution at this frequency. For this, an AMD RX 7000 is required.
Odyssey Neo G9 RTX 40 – not a good match!
At present, there are no 36 solutions if you want to enjoy your Samsung 240 Hz display in its native resolution. Indeed, according to tests by our South Korean colleagues Quasarzone, only AMD’s RX 7000 are capable of running on this screen. Unfortunately, neither the Intel Arc nor the RTX 40 are able to run at 7680 x 2160 @240 Hz.
Indeed, in this resolution, even an RTX 4090 was unable to display a smooth image. To achieve this, the display frequency had to be lowered to 120 Hz, despite the use of HDMI 2.1. Although HDMI 2.1 provides the necessary bandwidth for this configuration, it seems that the problem goes deeper than that.
Apparently, according to a redditor, the problem stems from a problem with DSC, an image compression system, and the number of RTX 40 pipelines. Without compression, such a resolution at this frequency would require a bandwidth of 109.68 Gbit/s, whereas DisplayPort 2.1 allows a bp of 77.37 Gbit/s, compared with 48 Gbit/s for HDMI 2.1. So when the RTX 4090 tries to display 7680×2160@240 Hz, a compression bottleneck occurs, and it doesn’t work well.
Of course, this is the shortened turbo version, but Tom’s Hardware explains the problem in more detail.
In absolute terms, you could say it’s a problem without being a problem, since de facto, it’s unlikely to play at 7680 x 2160 at 240 fps… But it’s still a shame not to be able to enjoy your screen in the conditions it was designed for.