🏴‍☠️ SOYO RX 580 2048SP (The Frankenstein Mod)

Turning a cheap Chinese refurb into a Mac Pro compatible beast.

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💀 The Situation

Listen, I know what you bought. You went on AliExpress and bought this "Soyo" RX 580 2048SP. It cost you peanuts. It's a re-soldered, re-flashed, Frankestein's monster of a card. It's ugly, it's sketchy, but it works.

The Problem: This card is effectively an RX 570 in disguise, but with a weird Device ID (6FDF).

• Windows: Works fine with hacked drivers.
• macOS: Dead silence. No acceleration. Black screen. macOS looks at this ID and says "I don't know you."

The Solution: We don't just flash a random RX 570 BIOS (that breaks your ports). We perform surgery on the original BIOS to spoof the ID while keeping the correct memory timings and port layout.

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🕵️ The "Soyo" Mystery (Trust Nobody)

Here is the kicker. When you plug this card in, GPU-Z will look you in the eye and tell you the memory is Hynix.

GPU-Z is lying. I took this card apart. I looked at the chips with my own eyes. They are Samsung. Typical Chinese refurb shenanigans. They flashed a BIOS with Hynix timings onto Samsung memory (or vice versa). This is why you cannot trust random BIOS files from the internet for this specific card.

This repo contains the modified BIOS specifically for this weird Samsung-chip variant.

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💉 The Mod (Hex Editing Surgery)

I didn't invent this; I just perfected it for this specific card. We modified the original Ellesmere.rom to identity as a pure RX 570 (67DF).

Technical Details

We opened the binary in a Hex Editor and made these changes:

1. The Model ID (Offset 0xD4)

The card originally identified as a weird 2048SP variant.

• Original: F0 FD E6 0F (Unknown / 2048SP)
• Patched: F0 7D E6 0F (RX 570 Signature)

2. The Device ID

We need macOS to see 67DF.

• Original: 02 10 DF 6F
• Patched: 02 10 DF 67

Note: This sequence appeared twice in the binary. Both were patched.

3. Checksum Fix

After editing, the BIOS signature was invalid. I used Polaris BIOS Editor to re-sign and fix the CRC.

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📂 Files in Repo

• Ellesmere_MOD.rom - THE MODDED BIOS. Flash this one.(not avaiable)
• Ellesmere.zip - The backup of the original factory BIOS (just in case you brick it).
• /photos - Proof that this card actually exists.

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⚡ Results

• macOS (Hackintosh/MacPro): Full Metal acceleration. Recognized natively.
• Performance: ~44k in Geekbench 5 Metal test.
• Outputs: All ports work (because we kept the original connector map).

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🛠 How to Flash

Option A: The Cowboy Way (Software)

1. Boot into Windows.
2. Use amdvbflash (version 2.93+ recommended for Polaris).
3. Run: amdvbflash -f -p 0 Ellesmere.rom
4. Pray.
5. Reboot.

Option B: The Professional Way (Hardware) I used a CH341a Programmer with a clip.

1. Clip onto the BIOS chip.
2. Read backup.
3. Write Ellesmere.rom.
4. This is 100% safe because you can't brick the card if you have a hardware flasher.

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⚠️ DISCLAIMER ⚠️ Flashing a GPU BIOS carries risks. I am not responsible if your card explodes, turns into a toaster, or becomes sentient. This worked for my specific "Soyo" card with Samsung memory. Check your memory chips before flashing!