Gigabyte Z790 GAMING X AX (rev. 1.x) Specification:
This HDMI port can operatie at a maximum bandwidth of 18 Gbps via Transition-minimized differential signaling (TMDS) protocol.
- 4K @ 60 Hz RGB 4:4:4 8-bit = 18 Gbps
- 4K @ 30 Hz RGB 4:4:4 12-bit = 13.37 Gbps
- 4K @ 60 Hz YCbCr 4:2:0 12-bit = 13.37 Gbps
- 4K @ 60 Hz RGB 4:4:4 12-bit = 24.06 Gbps = NOT possible
- 4K @ 60 Hz RGB 4:4:4 10-bit = 20.05 Gbps = NOT possible
- 4K @ 60 Hz YCbCr 4:2:2 12-bit = 17.82 Gbps = possible in terms of bandwidth but not supported by Intel hardware. However, the so-called chroma subsampling in 4:2:2 is not common. You don't really need this. If you want to read pixel-perfect text, choose 4:4:4 with a low refresh rate or with 8-bit color depth. If you want to watch videos with HDR and 60 Hz, then choose YCbCr 4:2:0 12-bit.
- If you want to keep RGB for 60 Hz, you need to reduce the Color Depth to BPC_8.
- If you prefer watching movies and media, you can reduce the Color Format to YCBCR_420 and keep higher bit depth.
High bit depth and RGB at the same time with 60 Hz is not possible due to lack of bandwidth via HDMI 2.0 (TMDS).
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Hello Jocelyn M.,
I appreciate your prompt response and willingness to assist.
Regarding your inquiries:
1. and 2. The shuttering issue is specific to movies with movement landscapes and occurs solely on my LG OLED G3 TV connected via HDMI. My primary monitor is a KTC H27T22.
3. I have attached the requested reports from Intel Graphics Command Center (IGCC) and Intel System Support Utility (Intel SSU) for your review.
To provide context, I initially experienced stuttering issues in movies, attributing it to the OLED technology's instantaneous response time. In an effort to resolve this, I explored the option of utilizing LG's TruMotion by switching the TV to 4K 120Hz. Regrettably, I discovered that outputting 120Hz at 4K resolution through HDMI with Integrated Graphics and this specific motherboard model is not supported.
However, I expected at least an additional option for 60Hz, yet the maximum I can output is only 30Hz. I'm perplexed as to why I cannot achieve 60Hz, especially when attempting to maintain a 10-bit color depth. Currently, I can only achieve 60Hz by downgrading the TV's output color depth from 10 bits to 8 bits.
Is it not feasible to output 4K 60Hz with integrated graphics at 10 bits color depth?
I would greatly appreciate your insights on this matter. If you need any further information or clarification, please feel free to ask.
Thank you for your ongoing assistance.
Best regards,
Christos
Gigabyte Z790 GAMING X AX (rev. 1.x) Specification:
This HDMI port can operatie at a maximum bandwidth of 18 Gbps via Transition-minimized differential signaling (TMDS) protocol.
- 4K @ 60 Hz RGB 4:4:4 8-bit = 18 Gbps
- 4K @ 30 Hz RGB 4:4:4 12-bit = 13.37 Gbps
- 4K @ 60 Hz YCbCr 4:2:0 12-bit = 13.37 Gbps
- 4K @ 60 Hz RGB 4:4:4 12-bit = 24.06 Gbps = NOT possible
- 4K @ 60 Hz RGB 4:4:4 10-bit = 20.05 Gbps = NOT possible
- 4K @ 60 Hz YCbCr 4:2:2 12-bit = 17.82 Gbps = possible in terms of bandwidth but not supported by Intel hardware. However, the so-called chroma subsampling in 4:2:2 is not common. You don't really need this. If you want to read pixel-perfect text, choose 4:4:4 with a low refresh rate or with 8-bit color depth. If you want to watch videos with HDR and 60 Hz, then choose YCbCr 4:2:0 12-bit.
- If you want to keep RGB for 60 Hz, you need to reduce the Color Depth to BPC_8.
- If you prefer watching movies and media, you can reduce the Color Format to YCBCR_420 and keep higher bit depth.
High bit depth and RGB at the same time with 60 Hz is not possible due to lack of bandwidth via HDMI 2.0 (TMDS).
Please turn this OFF within your TV settings:
If necessary, you can adjust the image with this afterwards:
I can offer the following check test. The TV here is an LG OLED65G39LA, the source is a NUC11TNKv7.
When the LG TV is set to HDMI Deep Colour ON, it sends these capabilities via EDID: 4K120 444 FRL6 DSC DV HDR10 HLG.
| 4K120 | resolution and refresh rate |
| 444 | colour model |
| FRL6 | available bandwidth Fixed Rate Link 6 (48 Gbps HDMI 2.1) |
| DSC | Display Stream Compression |
| DV | Dolby Vision |
| HDR10 | High Dynamic Range according to SMPTE ST.2084 |
| HLG | Hybrid Log Gamma, an HDR transfer function that provides BT.2020 colorimetry without metadata |
When the Game Optimiser is activated, you can add VRR (Variable Refresh Rate) and ALLM (Auto Low Latency Mode).
So with your source device you can achieve a maximum of 594 MHz TMDS (HDMI 2.0). I can see on my TV that with 4:4:4 Pass Through = OFF the options for TruMotion are available:
The green is the signal diagnosis of the HDfury VRROOM, which is arranged here between source and sink.
In any case, setting HDMI Deep Colour to OFF is not an option. In this case, the TV sends via EDID that it accepts a maximum of 297 MHz TMDS (HDMI 1.4). That's not enough for your needs. But you may have to ask Gigabyte which iGPU capabilities are actually provided by the motherboard. They design the signal path from the processor to the port. So it may be that not every theoretical mode (according to the processor specification) actually arrives at the port. We've already seen this in a more serious form here. For the DisplayPort output, this also applies to your motherboard, because the i5-13600K could actually provide DisplayPort 1.4a HBR3 (8K). But for some reason Gigabyte decided not to offer this to the customer.
DisplayPort version 1.2 = HBR2.
That's a good question. The HDMI specification in version 1.4 would explicitly allow 4K to 297 MHz TMDS.
But EDID always contains several so-called blocks. If only “Block 0, Base EDID” is parsed from the source, 4K will not appear there. “Block 1, CTA-861 Extension Block” contains the Video Identification Codes (VIC) shown above. In principle, this would only be possible via RGB with 8-bit, otherwise 297 MHz would be exceeded. YCbCr 4:2:0 is not supported in 297 MHz mode. Therefore, chroma subsampling can only be applied in conjunction with 50/60 Hz.
You've considered using a dedicated graphics card. With one of these cards you would have complete freedom in video signal configuration via the Nvidia control panel:
GeForce RTX 3050 WINDFORCE OC V2 8G
GeForce RTX 4060 WINDFORCE OC 8G
GeForce RTX 4060 OC Low Profile 8G
These cards are small, cheap, quiet and have two HDMI ports. They also offer true HDMI 2.1 Fixed Rate Link (FRL) Physical Layers (PHY) that can operate the LG G3 at 4K 120 Hz RGB 4:4:4 10-bit HDR.
