Samsung Odyssey G9 Neo (LS57CG952NUXEN) with an ultra-wide-angle 57″ monitor with a resolution of 7680 × 2160. That is, as a pair of 4k monitors without a distracting frame running through the middle. With a curved screen, 1ms response time, 240Hz refresh rate (also supports variable refresh rate) and HDR1000, it is primarily aimed at gamers.
Samsung Odyssey G9 Neo (QuasarZone)
QuasarZone editors who tested the monitor but ran into a problem. Both the GeForce RTX 4090 and the Arc A770 cannot achieve both full resolution and full refresh rate at the same time. Either the user has to lower the resolution or the refresh rate ends up at 120 Hz. From Korea’s QuasarZone, information was forwarded to the Western world by Tom’sHardware, but it was greatly distorted.
It says that whether you use DisplayPort 2.1 or HDMI 2.1 on the GeForce RTX 4090, the monitor works to a limited extent. This needs to be put into perspective – GeForce RTX 4090 (or Arc A770) do not support DisplayPort 2.1 at all. They don’t even support DisplayPort 2.0 and only offer the old DisplayPort 1.4 (2017).
Compatibility (QuasarZone)
That’s half the problem. DisplayPort 1.4 (compared to DisplayPort 1.3) offers data compression, but even that is not enough for data transfer: 7680 × 2160 × 240 [Hz] × 10 (bit) × 3 channels = 119.4 Gbps. DisplayPort 1.4 reaches 25.9 Gb/s with compression (3:1) of approx. 77.8 Gb/s. Which is not enough – what to reduce the color depth? Even without HDR (i.e. only 8 bits per channel instead of 10 bits), the transmission speed of the 7-year-old DisplayPort 1.4 is not enough: 95.6 Gb/s is needed to transmit an uncompressed stream, with compression 31.9 Gb/s, the graphics card interface only manages 25 .9 Gb/s.
What’s more interesting is that it doesn’t even work with HDMI 2.1 on the mentioned cards, which is not at DisplayPort 2.1 level, but physically reaches 48 Gb/s, which with compression (3:1) corresponds to an effective 144 Gb/s. That should be enough for a transfer of 119.4 Gb/s. But in practice it is again not enough. Tom’sHardware speculates whether there is a problem in the implementation of the compression algorithm itself on the side of the graphics card, which divides the image into areas (tiles) that are somehow arranged before compression – and whether the combination of dimensions and arrangement of these tiles is not the source of the problem.
Neither Nvidia nor Intel have commented on the situation as of this writing.
On Radeon RX 7900 XTX, when connected to DisplayPort 2.1, the monitor works without problems in full resolution (7680×2160), full color depth (10bit HDR) and full refresh rate (240 Hz). It currently works on HDMI 2.1 with a limitation to 120 Hz, while drivers are being prepared that will support 240 Hz on the HDMI output as well.
2023-09-25 22:10:20
#GeForce #RTX #handle #Samsung #Odyssey #Neo #240Hz #limits #120Hz
