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RX 550 no UEFI VBIOS?

Apocalypsee

Apocalypsee

Joined
Jul 15, 2006
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Location
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System Specs
Processor AMD Ryzen 7 5700G
Motherboard Gigabyte B450M-S2H
Cooling Scythe Kotetsu Mark II
Memory 2 x 16GB SK Hynix OEM DDR4-3200 @ 3666 18-20-18-36
Video Card(s) Colorful RTX 2060 SUPER 8GB
Storage 250GB WD BLACK SN750 M.2 + 4TB WD Red Plus + 4TB WD Purple
Display(s) AOpen 27HC5R 27" 1080p 165Hz
Case COUGAR MX440 Mesh RGB
Audio Device(s) Creative X-Fi Titanium HD + Kurtzweil KS-40A bookshelf
Power Supply Corsair CX750M
Mouse Razer Deathadder Essential
Keyboard Cougar Attack2 Cherry MX Black
Software Windows 10 Pro 22H1 x64
I just bought RX 550 but to my surprise when I enter the BIOS the CSM is automatically enabled, when I disable it it will revert back. Is VBIOS doesnt support UEFI for some reason? Can anyone kindly check it? GPU-Z have UEFI ticked. And while at it, is there any possibilities to be unlocked further from 768sp I already unlocked? The card is based on Polaris 21 so up to 1024sp can be unlocked, but I didn't dare to flash RX 560/460 VBIOS, not yet at least.

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abactuon

Joined
Nov 22, 2020
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The UEFI firmware should detect an older video card without a UEFI GOP code, so CSM will be enabled to enable legacy video BIOS code. You can still boot in UEFI mode because UEFI GOP includes support for invoking legacy video BIOS code via CSM. (In theory)

Disable 'Secure Boot' & 'Fast Boot'.

Even if your motherboard is equipped with UEFI capabilities, your OS won’t use it if your drive is formatted with MBR instead of GPT.
 
Last edited:
Apocalypsee

Apocalypsee

Joined
Jul 15, 2006
Messages
977 (0.15/day)
Location
Malaysia
System Specs
Processor AMD Ryzen 7 5700G
Motherboard Gigabyte B450M-S2H
Cooling Scythe Kotetsu Mark II
Memory 2 x 16GB SK Hynix OEM DDR4-3200 @ 3666 18-20-18-36
Video Card(s) Colorful RTX 2060 SUPER 8GB
Storage 250GB WD BLACK SN750 M.2 + 4TB WD Red Plus + 4TB WD Purple
Display(s) AOpen 27HC5R 27" 1080p 165Hz
Case COUGAR MX440 Mesh RGB
Audio Device(s) Creative X-Fi Titanium HD + Kurtzweil KS-40A bookshelf
Power Supply Corsair CX750M
Mouse Razer Deathadder Essential
Keyboard Cougar Attack2 Cherry MX Black
Software Windows 10 Pro 22H1 x64
abactuon said:
The UEFI firmware should detect an older video card without a UEFI GOP code, so CSM will be enabled to enable legacy video BIOS code. You can still boot in UEFI mode because UEFI GOP includes support for invoking legacy video BIOS code via CSM. (In theory)

Disable 'Secure Boot' & 'Fast Boot'.

Even if your motherboard is equipped with UEFI capabilities, your OS won’t use it if your drive is formatted with MBR instead of GPT.
Click to expand...
Secure Boot and Fast Boot is always disabled on my system, drive is on GPT. I should have said my previous card, GTX 1070 works great with CSM disabled, its only when I use this RX 550 it automatically turn on CSM.
 
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