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Investigating possible firmware/AGESA bug on AM5, help wanted.

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Processor Ryzen 9 9950X
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Memory 64GB (2x 32GB) G.Skill Flare X5 @ DDR5-6000 CL30
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As described elsewhere, I've been trying to get my system in my specs to boot above ddr5-2000 (lol) with 4x32GB sticks DDR5. This seemed impossible to do despite all logic, until I noticed something.

GearDown mode.

Setting GearDown mode to Auto let me boot.

Investigating further, I discovered that if you set GearDown mode to disabled, the entire range of 2200MT/s through 4600MT/s no longer works.

Now my question is: is this an AGESA bug, a GIGABYTE bios bug, or maybe even both? I need to know who to write about this essentially.

How to test if you want to help me gather data:

1.) Enter UEFI.

2.) Set Geardown mode to "Disabled"

3.) Set memory speed to something in that above range, lets all just do DDR5-4000 for consistency.

4.) Profit? Or rather if you have the same bug, get ready to reset your CMOS, because in my case the rig enters an eternal bootloop until you do, never ever recovering. Yes even with one stick.

Thanks in advance for any help you fellow AM5 users can offer.
 
Last edited:
Joined
Aug 20, 2007
Messages
21,720 (3.40/day)
Location
Olympia, WA
System Name Pioneer
Processor Ryzen 9 9950X
Motherboard GIGABYTE Aorus Elite X670 AX
Cooling Noctua NH-D15 + A whole lotta Sunon, Phanteks and Corsair Maglev blower fans...
Memory 64GB (2x 32GB) G.Skill Flare X5 @ DDR5-6000 CL30
Video Card(s) XFX RX 7900 XTX Speedster Merc 310
Storage Intel 5800X Optane 800GB boot, +2x Crucial P5 Plus 2TB PCIe 4.0 NVMe SSDs
Display(s) 55" LG 55" B9 OLED 4K Display
Case Thermaltake Core X31
Audio Device(s) TOSLINK->Schiit Modi MB->Asgard 2 DAC Amp->AKG Pro K712 Headphones or HDMI->B9 OLED
Power Supply FSP Hydro Ti Pro 850W
Mouse Logitech G305 Lightspeed Wireless
Keyboard WASD Code v3 with Cherry Green keyswitches + PBT DS keycaps
Software Gentoo Linux x64 / Windows 11 Enterprise IoT 2024
Which Motherboard model and BIOS? I can't se the sign on mobile.
Gigabyte Aorus Elite AX rev1.0, like your last review. Tested on all beta bioses since the last stable, including the stable build (anything earlier does not support my 9950x). You can test from any board/cpu you like though, that helps rule out a global AGESA bug.

Fun hint: you can see my system specs on mobile, you just need to go to the users profile page.
 
Last edited:
Joined
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Messages
21,720 (3.40/day)
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System Name Pioneer
Processor Ryzen 9 9950X
Motherboard GIGABYTE Aorus Elite X670 AX
Cooling Noctua NH-D15 + A whole lotta Sunon, Phanteks and Corsair Maglev blower fans...
Memory 64GB (2x 32GB) G.Skill Flare X5 @ DDR5-6000 CL30
Video Card(s) XFX RX 7900 XTX Speedster Merc 310
Storage Intel 5800X Optane 800GB boot, +2x Crucial P5 Plus 2TB PCIe 4.0 NVMe SSDs
Display(s) 55" LG 55" B9 OLED 4K Display
Case Thermaltake Core X31
Audio Device(s) TOSLINK->Schiit Modi MB->Asgard 2 DAC Amp->AKG Pro K712 Headphones or HDMI->B9 OLED
Power Supply FSP Hydro Ti Pro 850W
Mouse Logitech G305 Lightspeed Wireless
Keyboard WASD Code v3 with Cherry Green keyswitches + PBT DS keycaps
Software Gentoo Linux x64 / Windows 11 Enterprise IoT 2024
Ohh I still have it :). Can try this weekend and see what happens.
I still couldn't get over ddr5-4000 but thats a heck of a lot better than 2000, at least. The weird thing is that I can replicate this odd bug with a single stick. May be granite ridge specific too, dunno.
 
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I'm not sure but thought I had read where gear down mode 2 works above certain speeds and 1 won't.
Disabling it might leave it set at default gear 1.
 
Joined
Aug 20, 2007
Messages
21,720 (3.40/day)
Location
Olympia, WA
System Name Pioneer
Processor Ryzen 9 9950X
Motherboard GIGABYTE Aorus Elite X670 AX
Cooling Noctua NH-D15 + A whole lotta Sunon, Phanteks and Corsair Maglev blower fans...
Memory 64GB (2x 32GB) G.Skill Flare X5 @ DDR5-6000 CL30
Video Card(s) XFX RX 7900 XTX Speedster Merc 310
Storage Intel 5800X Optane 800GB boot, +2x Crucial P5 Plus 2TB PCIe 4.0 NVMe SSDs
Display(s) 55" LG 55" B9 OLED 4K Display
Case Thermaltake Core X31
Audio Device(s) TOSLINK->Schiit Modi MB->Asgard 2 DAC Amp->AKG Pro K712 Headphones or HDMI->B9 OLED
Power Supply FSP Hydro Ti Pro 850W
Mouse Logitech G305 Lightspeed Wireless
Keyboard WASD Code v3 with Cherry Green keyswitches + PBT DS keycaps
Software Gentoo Linux x64 / Windows 11 Enterprise IoT 2024
I'm not sure but thought I had read where gear down mode 2 works above certain speeds and 1 won't.
Disabling it might leave it set at default gear 1.
It should be able to easily run GDM disabled at these speeds with a single stick, so its clearly a bug somewhere I think.
 
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