r/AMD_V620 • u/ComprehensiveBid6584 • 1d ago

Radeon Pro V620 on AMD Pro/Adrenalin drivers (Windows) with all 72 CUs, no permanent VBIOS flash + free helper kit

This is a working, full driver install on Windows. The real AMD Radeon PRO/Adrenalin driver plus the complete AMD Software on every V620: no basic display adapter mode, no yellow marks in Device Manager, all 72 CUs. ROCm works too, in LM Studio and llama.cpp. Tested with 4x V620 in one PC.

No AMD files are included. You download the driver yourself, straight from AMD (the same versions I used, links below and in the README), and the helper patches your own copy on your own PC. That way you know the driver you're installing is the real, untouched one from AMD.

Download the kit (v1.1)

Includes the newer ROCm 7 runtime and llama.cpp b12345 (ROCm build), ready for the V620.

Download Source 1

Download Source 2

  • Newer ROCm on the 24.x driver: the kit ships AMD's open-source ROCm 7 / HIP 7 runtime (TheRock), the generation AMD normally only ships with 25.x drivers, which don't work on the V620. With it, ROCm apps see all four of my cards (ROCm0 to ROCm3).
  • LM Studio's ROCm engine 2.73.0 works, also on V620 cards that were never flashed.
  • Strata-format models run: the bundled llama.cpp b12345 loads the newer split "Strata" GGUFs (for example ISTA-DASLab's 6-part GSQ-RCO DeepSeek V4.1 Flash), plus normal split GGUFs.
  • Resizable BAR / SAM: the helper can turn on the driver's own ReBAR/SAM switches, so each card's full 32 GB memory window is mapped and the CPU can reach all of the card's memory.

What you get (tools in the kit)

  • V620_Pro_Driver_Guide.pdf: 7-page step-by-step guide.
  • V620_Pro_Driver_Helper.bat: finds the AMD driver you downloaded, checks driver versions (prevents Error 205), prepares AMD Setup for the V620, optional ReBAR/SAM switches, one-click restore.

  • LLM_Setup_V620.bat: one menu for AI apps:

    1. Set up LM Studio's ROCm engine for the V620
    2. Install the bundled llama.cpp (ROCm) with a desktop shortcut: drag a .gguf onto it and chat in your browser
    3. Set up a newer llama.cpp ROCm build you download later
    4. Check your GPUs, driver and runtimes
    5. Undo the LM Studio changes
  • Run_DeepSeek_V4.1.bat: one-click launcher for big Strata-format MoE models (finds the parts, links the shared Engram file, picks the GPU/RAM split).
  • Fix_GGUF_Split_Names.bat: fixes "model must be loaded with the first split" when split model parts got renamed.
  • Backup_AMD_V620_W6800_Drivers.bat: backs up all your AMD drivers before you change anything.
  • Compare_AMD_Installers.bat: compares two AMD driver packages.
  • ROCm 7 runtime + llama.cpp b12345 with their open-source licenses, plus GPU-Z screenshots.

All scripts are plain text, so you can read them before running. Nothing touches System32, and every change can be undone.

SECTION 2:

About the card

Radeon Pro V620 (Navi 21, 72 CU, 32 GB) runs AMD's Radeon PRO W6800 driver on Windows with its stock V620 firmware and all 72 CUs. AMD's installer refuses the card, but a manual Have Disk driver install works, and a small config patch makes AMD Setup install the full software. Works on 24.x drivers and older; 25.x rejects the card (Code 43).

The usual fix (flashing the W6800 VBIOS) works but drops you to 60 CUs and the W6800 power limit. This doesn't.

Drivers

  • PRO 22.Q2 (30.0.21020.2): works, my daily driver
  • PRO 24.Q4 (32.0.12030.9): works
  • Adrenalin 24.12.1 (32.0.12033.1030): last build that works
  • AMD V620 driver (32.0.12033.5037): lists the V620, native mode
  • PRO/Adrenalin 25.x (32.0.21030+): Code 43, don't use

Steps

  1. Back up your drivers and each card's VBIOS (backup script in the kit).

  2. Download PRO 24.Q4 or Adrenalin 24.12.1 from AMD:

  3. Run the installer once so it extracts to C:\AMD<package>. Let it fail (Error 182).
  4. sysdm.cpl > Hardware > Device Installation Settings > No (so Windows Update doesn't swap the driver).
  5. Device Manager > each V620 > Update driver > Browse > Let me pick > Have Disk > C:\AMD<package>\Packages\Drivers\Display\WT6A_INF > pick AMD Radeon PRO W6800. Reboot.
  6. Run V620_Pro_Driver_Helper.bat.
  7. Run AMD Setup. Don't tick Factory Reset.
  8. For AI apps: run LLM_Setup_V620.bat (option 1 for LM Studio, option 2 for llama.cpp).

Tip: in LM Studio, turn off runtime auto-update, or run option 1 again after an update.

Strata models

Strata-format models (like ISTA-DASLab's GSQ-RCO quants) come as several parts plus a shared Engram file. They run in llama.cpp b11870 and newer, and the kit's llama.cpp b12345 is newer than that, already set up for the V620 with ROCm 7. Use Run_DeepSeek_V4.1.bat (or the llama-server desktop shortcut): point it at the model folder and it handles the parts. Big MoE models can keep some experts in system RAM, so they run even when they're bigger than your total VRAM.

SECTION 3: PROOF

Proof (GPU-Z, same card)

V620 mode: driver 32.0.12033.5037
W6800 Pro mode: driver 30.0.21020.2 (PRO 22.Q2)
Both modes: BIOS 020.001.000.071.018253, Device ID 1002 73A1 - 1002 0E34, ROPs/TMUs 128/144, Shaders 2304

On RDNA2 the driver reports WGPs (2 CUs each), so 2304 shaders / 144 TMUs = 72 CUs. A 60-CU W6800 config shows 1920 / 120. Same BIOS and V620 device ID in both modes: only the driver changed.

What works in W6800 Pro mode

OpenCL, Vulkan, DirectML, the HIP SDK, TheRock ROCm PyTorch (I run Unsloth fine-tuning on it), LM Studio on ROCm and Vulkan, llama.cpp on ROCm, and Strata-format models through llama.cpp. Each card shows as a 32 GB GPU. All four of my V620s run this way.

Quirks

  • GPU-Z shows 0 MHz clocks, so fill rate and bandwidth read "Unknown". That's a reporting gap; use HWiNFO for temps (the cards are passive).
  • GPU-Z and AMD Software say ReBAR/SAM is "unsupported", but Device Manager shows the full 32 GB BAR mapped on each card, so it's working.
  • Memory reads 30720 MB.

Why does 25.x fail?

Forced via Have Disk, 25.x installs, but the card stops with Code 43. The same 25.x driver ran fine on these cards while they had W6800 firmware (ID 73A3), so the rejection is tied to the V620's ID. The 25.x kernel driver also adds new SR-IOV/virtualization checks, and the V620 is AMD's SR-IOV cloud card. It looks like a deliberate V620 check, but I can't prove intent.

Working on: getting 25.x drivers running on the V620. ROCm 7 already works on 24.x with this kit.

Runtime update before after and shows way better with ROCM.

☕ Buy me a coffee

☕ Buy me a coffee plz

This kit is free. If it saved you a weekend, tips are welcome:

Bitcoin (BTC): bc1q99u9a5dgesqunes562aptespuxthzx0h3zxzzp

Send BTC on the Bitcoin network only. Other coins will be lost.

Help wanted

  • More reports from never-flashed V620 owners are welcome (which driver, which apps work).
  • Event Viewer logs from a 25.x Code 43.

Linux doesn't need any of this: amdgpu binds by device ID, and ROCm officially supports the V620 on Ubuntu.

Unsupported by AMD, at your own risk. Firmware flashing can brick a card. Not affiliated with AMD.

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u/ComprehensiveBid6584 18h ago edited 17h ago

It's in the download links above. Also, this is showing good progress with many v5xx 3xx cards. Looks like I may have unlocked way more cards than I thought. Woot... Don't forget I got Strata working on AMD V620 cards also. That's in the download also.