Monitor Tests Forum

Hello guys,

sorry to bother you but i'm really frustrated right now.

So i recently bougth the Samsung Odyssey Neo G9 G95NC as a "upgrade" from my Samsung Odyssey G9 G93SC (OLED) which i always used in PbP mode with 21:9 + 11:9 working perfectly fine.
But now the 21:9 part seems blurried and for the 11:9 part i can't select 120Hz in the windows display settings. If i switch to 2x 16:9, nothing is blurried and both parts can be used with 120Hz at the same time. So for me there is no limit in bandwidth at all.

Back to 21:9 + 11:9 windows says "(recommended)" for 3440x1440, also the nvcp, but desktop mode and active signal mode are both 5120x2160 but it still looks burried like 3440x1440. Also it is not zoomed, as it should be (?) if a lower resolution is used. If i disable pbp and use a custom resolution (via nvcp, yep that works dunno why) with 5120x2160@240Hz, it display in the middle with black bars on both sides perfectly fine.

Did some research and read ALL threads i've found but apparently no one has this problems or is using 21:9 + 11:9, asked perplexity ai and it said that my gpu could be the reason for the interpolation because 5120x2160 is not in the Detailed Timings Descriptor due to it's limit of 4,095 horizontal pixels so it is in a extension block (found it) and windows prefers the Detailed Timings Descriptor over the extension blocks IF using PbP.

Can anyone tell me how to fix this ??? Also the 60hz limitation of the 11:9 part.


Greets

How is the monitor connected, DisplayPort or HDMI? Are you using two cables for picture-by-picture?

What GPU do you have? This might an issue with the 21:9 portion requiring Display Stream Compression (DSC). 5120x2160 @ 120 Hz would require DSC for NVIDIA RTX 3000/4000-series GPUs but not 5000-series. 2x16:9 with 3840x2160 @ 120 Hz would not require DSC when using two HDMI connections.

Hello, thanks for your answer. It is connected with a DP 2.1 and HDMI 2.1 cable to my RTX 5090, i'm using DisplayPort for the 21:9 part.

Also 7680x2160@240Hz over DisplayPort is working fine. Here is a EDID export:
00 FF FF FF FF FF FF 00 4C 2D 7B 74 5A 50 51 30
0C 23 01 04 B5 8C 28 78 3A 4E D5 AE 4E 45 AA 27
0E 50 54 25 CF 00 71 4F 81 C0 81 00 81 80 95 00
A9 C0 B3 00 D1 C0 EB F9 70 A0 D0 A0 29 50 30 20
3A 00 78 90 51 00 00 1A 00 00 00 FD 08 3C 78 1E
14 95 00 0A 20 20 20 20 20 20 00 00 00 FC 00 4F
64 79 73 73 65 79 20 47 39 35 4E 43 00 00 00 FF
00 48 4E 54 59 33 30 30 32 39 34 0A 20 20 01 4F
02 03 13 F0 46 C1 7E 10 3F 04 03 23 09 07 07 83
01 00 00 E7 7C 70 A0 D0 A0 29 50 30 20 3A 00 78
90 51 00 00 1A 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06

The 5120x2160 part looks fine. It's defined as a TV resolution, and it shouldn't require DSC with the RTX 5090. If the active and desktop resolutions are both 5120x2160, then the issue is on the monitor's end, possibly a bug in the firmware. What's the EDID for the 2560x2160 part? What about if you use two HDMI cables instead?