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Help Just upgraded from Ryzen 1600 to 3700X and I'm stuck in a boot loop

PC specs:

  • CPU: AMD Ryzen 7 3700X
  • MB: Asus Prime B350-Plus
  • GPU: ZOTAC GeForce® GTX 1060 6GB AMP! Edition
  • RAM: Kingston HyperX Fury 2x8GB DDR4 (2400MHz at stock)
  • SSD: Samsung 850 evo 250GB
  • PSU: 550W EVGA SuperNOVA G3 80+

As the title says, my PC keeps restarting, long before Windows lockscreen pops up. I can get into BIOS, and when I undervolt the CPU at some minimal offset and ratio less than 36 (34 is the highest I tried, didn't bother since it won't even run 36) I can get into the Windows. I've tried clearing CMOS, flashing different BIOS version, updating chipset drivers, I even reinstalled the Windows, but nothing helped. Tried with only 1 stick of ram, same results. I tried setting the FCLK at half the speed of RAM, nothing. Also, mouse cursor is laggy in bios compared to when 1600 was installed.

At this point I have no clue what is the problem and I need some help.

 
 
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4 minutes ago, Alcohero_ said:

PC specs:

  • CPU: AMD Ryzen 7 3700X
  • MB: Asus Prime B350-Plus
  • GPU: ZOTAC GeForce® GTX 1060 6GB AMP! Edition
  • RAM: Kingston HyperX Fury 2x8GB DDR4 (2400MHz at stock)
  • SSD: Samsung 850 evo 250GB
  • PSU: 550W EVGA SuperNOVA G3 80+

As the title says, my PC keeps restarting, long before Windows lockscreen pops up. I can get into BIOS, and when I undervolt the CPU at some minimal offset and ratio less than 36 (34 is the highest I tried, didn't bother since it won't even run 36) I can get into the Windows. I've tried clearing CMOS, flashing different BIOS version, updating chipset drivers, I even reinstalled the Windows, but nothing helped. Tried with only 1 stick of ram, same results. I tried setting the FCLK at half the speed of RAM, nothing. Also, mouse cursor is laggy in bios compared to when 1600 was installed.

At this point I have no clue what is the problem and I need some help.

 
 

I believe this motherboard supports only 1 and 2 gen AMD Ryzen processors.
https://www.asus.com/us/Motherboards/PRIME-B350-PLUS/specifications/

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1 minute ago, TwisteddJoker said:

I believe this motherboard supports only 1 and 2 gen AMD Ryzen processors.

It supports the 3rd gen Ryzen.

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6 minutes ago, Alcohero_ said:

Well, then the info is both right and wrong. Both on Asus site. So now I'm not sure what to think about it.
What I would do - I would put the old CPU back in to see if that helps. If yes - I would update the BIOS to the newest available version.

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BIOS is already at the latest available version, 5602. It's working when I lock its frequency at less than 36 ratio, otherwise it's not.

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14 minutes ago, Alcohero_ said:

It supports the 3rd gen Ryzen.

 

16 minutes ago, TwisteddJoker said:

I believe this motherboard supports only 1 and 2 gen AMD Ryzen processors.
https://www.asus.com/us/Motherboards/PRIME-B350-PLUS/specifications/

Their website is very weird about it. On the motherboard Specifications page, it says 1st/2nd gen Ryzen supported but for BIOS revisions, they add 3rd gen Ryzen support since it notes they removed Gen4 support from Ryzen 3000 series.

CPU Cooler Tier List  || Motherboard VRMs Tier List || Motherboard Beep & POST Codes || Graphics Card Tier List || PSU Tier List 

 

Main System Specifications: 

 

CPU: AMD Ryzen 9 5950X ||  CPU Cooler: Noctua NH-D15 Air Cooler ||  RAM: Corsair Vengeance LPX 32GB(4x8GB) DDR4-3600 CL18  ||  Mobo: ASUS ROG Crosshair VIII Dark Hero X570  ||  SSD: Samsung 970 EVO 1TB M.2-2280 Boot Drive/Some Games)  ||  HDD: 2X Western Digital Caviar Blue 1TB(Game Drive)  ||  GPU: ASUS TUF Gaming RX 6900XT  ||  PSU: EVGA P2 1600W  ||  Case: Corsair 5000D Airflow  ||  Mouse: Logitech G502 Hero SE RGB  ||  Keyboard: Logitech G513 Carbon RGB with GX Blue Clicky Switches  ||  Mouse Pad: MAINGEAR ASSIST XL ||  Monitor: ASUS TUF Gaming VG34VQL1B 34" 

 

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some things you could try :

 

reset CMOS 

reflash the BIOS 

contact Asus 

get another motherboard 

The direction tells you... the direction

-Scott Manley, 2021

 

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2 hours ago, Mark Kaine said:

some things you could try :

 

reset CMOS 

reflash the BIOS 

contact Asus 

get another motherboard 

I tried the first two. I will contact ASUS, didn't think of that. If I don't fix it I'll kinda have to buy a new motherboard, but that's the last option.

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I also tried another stick of ram. G.Skill F4-3000C16-8GISB, same thing happened. I didn't mention it, my ram is HX424C15FB2/8.

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11 hours ago, CommanderAlex said:

 

Their website is very weird about it. On the motherboard Specifications page, it says 1st/2nd gen Ryzen supported but for BIOS revisions, they add 3rd gen Ryzen support since it notes they removed Gen4 support from Ryzen 3000 series.

 

Probably the trace routing is not PCI-E 4.0 compliant, so they locked it at PCI-E 3.0 at a firmware level.

PCI-E 4.0 is higher bandwidth (2x of PCI-E 3.0), so in theory, you need to have decent routing on the PCB to avoid signal/data distortion.

Given it's a budget B350 board, it probably wasn't up to ASUS' standard.

 

(And I think in AMD's docs, A320 / B350 / X370 does not get PCI-E 4.0 support)

(They even have the 'Removes Gen 4 support...' bit even on the top-tier ASUS X370 ROG Crosshair VI Hero board).

 

EDIT: 

My assumption was correct lel

 

AMD Confirms PCIe 4.0 Not Coming to Older Motherboards (X470, X370, B350, A320)

Quote

Moving from PCIe 3.0 to PCIe 4.0 on a motherboard isn’t overly difficult. In order to qualify for PCIe 4.0 use, the signaling guidelines for the connecting traces between the CPU and PCIe slots have to be met. If the PCIe 3.0 motherboard was over-engineered in the first place, and supports PCIe 3.0 very well, there is every chance that those same connecting traces can carry a PCIe 4.0 signal without any issue. The problem becomes when some motherboards can succeed in PCIe 4.0, whereas others cannot because they can only barely support PCIe 3.0.

 

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Intel X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)

  • i7-8086K @ 5.1 GHz (still tweaking) -- i7-6800K
  • Gigabyte Z390 Aorus Master -- ASUS X99 Deluxe
  • Sapphire NITRO+ RX 6800 XT Special Edition Sapphire NITRO+ RX 5700 XT Special Edition -- 2x Sapphire NITRO R9-Fury in Crossfire
  • 32GB G.Skill TridentZ DDR4-3000 CL14 (16GB TridentZ RGB + 16GB Red/Black TridentZ)
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