Vega GPU works at HBR3 with a 4k 120hz monitor?

[xiaooloong]

Suddenly my HVK can work at HBR3 and support 4k 120hz 8bit. Does the hardware has native support for HBR3 or even DSC ?

macOS Big Sur 11.6.5 (20G527)

/System/Library/Extensions/AppleGraphicsControl.kext/Contents/MacOS/AGDCDiagnose -a
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* 4: [DP 1.2 4 x HBR2]   Status: [4 x HBR3 7777]         caps [features 0x101001b, p_encoding 0xd]              Sink   OUI:000-224-076 Dp1.4? [068-112-049-046-052-000] HW Version: 16   FW Version: 3.0
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DisplayPort Version     12
Link Lanes      4 {4,4}
Link Rate (Mbps)        8100 {8100,8100}
Link Bits       24 {24,30}
Voltage Swing (Level)   {0,0,0,0}
Pre-Emphasis (Level)    {0,0,0,0}
Spread  Enabled
Enhanced Framing        Enabled
Scrambler       Enabled
MST     Disabled
No Mst  YES
Force Training Times    YES
Force Framing   YES
Force Bit-Depth Range   YES
Force EQ Training Pattern       YES
Active Info 00 3        DICT    16
Connected       Yes
Dual Link       No
Coherent        No
MST     No
Connection Type DP
Pixel Clock     1066560 kHz
Lane Count      4
Link Clock      810000 kHz
Link Bits       24 bpc
CRTC Index      0
PLL Index       6
Backlight Freq  0 Hz
Link Format     RGB
DIG FE  F
Number of Devices       1
Timing  DICT    21
Display Mode    80003033
Refresh Rate (Calculated)       120 Hz
Refresh Rate (Stored)   0.0 Hz
Window (Active) 3840 x 2160
Window (Scaled) 0 x 0
Scaled Inset    0 x 0
Pixel Clock     1066560000 Hz
Scaler Flags    0
Signal Config   0x2
Blanking        160 x 62
Border {left,right}     {0, 1920}
Border {top,bottom}     {0, 0}
Sync Offset (h, v)      48 x 3
Sync Pulse Width (h, v) 32, 5
Sync Config (h, v)      - x -
Num Links       1
VB Extension    0
Pixel Encoding  1 (RGB444)
Bits Per Color Component        2 (8 bpc)
Colorimetry     1 (RGB)
Dynamic Range   32 (Traditional Gamma SDR)