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The ASRock Arc A580 Challenger has an HDMI port version 2.0b. This means 4K @ 120 Hz is not possible. However, you can use a protocol converter cable that is connected to one of the DisplayPort outputs. Products that contain the Synaptics VMM7100 chip have proven themselves.
This image was photographed from an LG OLED65G39LA TV. The used graphics card is a background image in Microsoft Windows. The dark blue box in the lower part of the screen is the On Screen Display (OSD) of the new AV Receiver Denon AVC-X4800H and shows its signal diagnosis. The green writing is the HDfury VRROOM signal diagnostics OSD laced between the source and the AV Receiver.
Product | Connection | Chip Type | Current Firmware |
|
or PremiumCord (amazon.se) | DisplayPort 1.4a > HDMI 2.1 FRL | Synaptics VMM7100 | 7.02.130 |
- Dolby Atmos/DTS:X are supported.
- VESA Adaptive Sync, Nvidia G-Sync, AMD FreeSync and HDMI Variable Refresh Rate (VRR) are NOT supported.
If you connect one of these cables to the LG 4K QNED81, 4K @ 120 Hz RGB 10 bpc HDR at Fixed Rate Link (FRL) 5 with a link rate of 40 Gbps is possible. With a suitable display device, the Intel Arc can also output 8K @ 60 Hz YCbCr 4:2:0 10 bpc HDR (FRL 5, 40 Gbps). The output on HDMI site is done with a Quantization Range of 16 – 235. It has been shown that LG TVs do not automatically detect this. According to the operating instructions, you must either switch OFF “4:4:4 Pass Through” in order to allow image processing by the TV:
Or change the following to "LIMITED". This considers Output Level 16 - 235, which is normal HDMI video range, 16 being pure black and 235 being pure white.
If you have problems with the cable, you can also perform a firmware update on the integrated VMM7100 chip following these instructions. The firmware is attached to the linked article.
ASRock Intel Arc A750 Challenger has two HDMI outputs. Make sure you plug to the correct one:
This HDMI port is basically able to output 4K @ 120 Hz RGB 10 bpc HDR. But be aware that HDMI Variable Refresh Rate (VRR) cannot be provided via HDMI port on Intel Arc Alchemist/DG2 architecture. VRR is an HDMI specification. Since the HDMI 2.1 port is not native there is no way to provide VRR. This is also the reason why the connection is always shown as "DisplayPort" in the diagnostic data.
Intel Arc Alchemist DG2 Topology
That's why one should turn OFF the Game Optimiser in the LG TV settings ("VRR", "VRR & G-Sync" and "AMD FreeSync Premium")
This is really very interesting. I just looked at the ASRock Arc A750 Challenger printed circuit board here and unlike the Intel reference design with the Realtek RTD2173, ASRock uses the Synaptics VMM7100 as PCON on this board.
