Why my ddr5 ram only read as 3600mhz instead of 4800mhz

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TwstedTV@reddit

I am going through the same thing. When I first installed my OS and programs and

booted my system I was getting 4800mhz with all four ram slots taken using 128gb ram.

then I booted the system and it now only reads 3600mhz.

So I rebooted yet again and went into the bios and turned on expo/xmp and saved.

I rebooted and went into the OS and it still only reads 3600mhz.

I rebooted a third time and went into the bios and tried again and no matter what I do

it will not go into either 4800, 5200 or 6000. it only goes into 3600.

I have 128gb GSkill 128-gb (4-sticks) DDR5 6000mhz memory.

It worked for only the first 2 days in 4800 just fine and now it never wants to go back up.

I cleared CMOS and retrained my memory several times and it just won't go past 3600.

its frustrating and annoying, because I purposely purchased expensive ddr5 memory

just so I can get 6000 or even 52000. Even though the ram is specifically rated for 6000.

But it just won't do it, it only goes to 3600 max.

I have the Gigabyte X670E XTreme paired with Ryzen 9 (7950X) CPU and
GSkill (F5-6000J3040G32GX2-TZ5NR) which is in the QVL approved list for my board.
And I am using the latest BIOS AGESA 1007b and the latest chipset drivers.

I am stumped.

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echae@reddit

I have the same exact issue with corsair 6000 MHz DDR5, gigabyte x670e aorus and it’s latest firmware

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VictorRH@reddit

what you did? same issue here

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echae@reddit

I read that it won't work before Gigabyte updates the x670's AGESA 1.0.0.7 c to something much newer. So no xmp/expo for some DDR5's before the bios gets upgraded.

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New-Travel10@reddit

if you have full bank of RAM, and ram clock over 3600 might not even boot. you have to fix it up to 3600 (AMD guideline), or use 3 RAMs max.

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SecondArctic@reddit

Where is this info posted? I'm running a B650E-F Mobo, with 4 16GB sticks of G Skill (64GB total), and cannot boot it above 3600MT/s.

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New-Travel10@reddit

https://www.amd.com/en/products/processors/desktops/ryzen/7000-series/amd-ryzen-9-7950x3d.html

https://www.amd.com/en/products/processors/desktops/ryzen/9000-series/amd-ryzen-9-9950x.html

you go to connectivity section, you can find max memory speed supported by each cpu.

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SecondArctic@reddit

I’ll take a look now. Thanks so much for sharing this!

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Gullible_Cup455@reddit

I have the latest bios..................................still 3600mhz.

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echae@reddit

Yes, I eventually got it working by buying a different brand of memory. Corsair vengeance did not work with it.

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Pitiful-Ideal1966@reddit

How did you make it work? Which brand did you buy?

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echae@reddit

G.Skill 2x32 GB

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MGMT_LoL@reddit

Same issue- 6000mhz ddr5 gskill, r7 9800x3d, proart x870e Can't get this thing above 3600. Used to be fine at 4800 before I wanted to increase it. Now I'm fucked lol

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DragonRR1@reddit

Same problem but with Asrock Taichi X870 and 128gb Kingston 5600 ram, running at 3600. Refuses to run faster

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Ok-Committee5924@reddit

Ra

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MotherScreng@reddit

same situation here, g.skill ddr5 6000 should run at 4800 on my AMD cpu. it even is labeled in bios as 16GB-DDR5-4800 @ 3600mhz for each of the 4 ram slots (A_1 A_2 B_1 B_2). PBO is on. if i do *anything* related to the ram, the board wont boot and i have to reset bios (which thankfully is painless on this ASRock mobo). motherboard bios is latest, updated recently (3/25/2024)

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KeiichiTsuchiyasCat@reddit

Did you ever fix the issue? Having the same problem

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King__Karnage@reddit

Having same exact issue with gskill any fix?

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CoolCalmPele@reddit

I'm in the same boat with an ASUS B650M-Plus WiFi motherboard, Ryzen 7 7800X3D, and G.Skill Trident Z5 Neo 2 x 16 GB RAM (2 sets, 4 sticks total for 64 GB, model F5-6000J3038F16GX2-TZ5N). The RAM is rated for 4800 MHz, but I can't use any EXPO setting to boost it to the 6000 MHz it advertises or it constantly crashes. Even just keeping it at 5200 MHz doesn't work... and yet it's stuck at 3600 MHz. All firmware is up to date, so I'm just dumbfounded.

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DoIOffendYou@reddit

You can't mix kits with ddr5. You HAVE to buy a 4 dimm kit so that they are timed together. If they don't come from production together, there's a 99% chance they will not work without hours of custom timing and crashes.

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B16B0SS@reddit

I do not think it will work. If you look at memory support you will see that most x4 configurations are single rank while your rand is dual. So the MB is basically trying to run x8 single ranks and its just out of spec. I do not think AMD will be able to fix this with bios updates - it requires very loose timing which is why you are stuck at 3600

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CoolCalmPele@reddit

This is my first build, so I’m not familiar with what dual rand or single ranks means - I’ll definitely look it up, but are you suggesting I need a different MoBo that can handle all four slots running in “single rank” configuration to get advertised EXPO speeds, or even just DDR5 speeds? I believe 3600 MHz is DDR4 speeds, so not getting basic DDR5 speeds (much less EXPO) has been frustrating.

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B16B0SS@reddit

It means that there are 2x the chips for the same amount of memory in dual rank than for single rank

So 4 dual rank sticks of ram is equi to 8 sticks of single rank

It takes more from the memory controller to run that many ranks so it likely will never work. You should look into returning the ram and getting a single 64gb kit using two sticks

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CoolCalmPele@reddit

This worked! I can’t thank you enough, but I’d be happy to buy you a coffee if you use Venmo.

For anyone with similar issues in the future where 4 sticks of RAM (4x16 GB) will not run at EXPO-advertised or even minimum DDR5 speeds, I swapped them out for 2 sticks of RAM (2x32 GB) on my ASUS B650M-Plus WiFi motherboard and I now get a stable experience when using EXPO settings/RAM speed (in my case 6000 MHz).

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B16B0SS@reddit

Glad that it worked. Don't worry about the coffee, I'm happy that I was able to help you out \^_\^

The motherboard manufacturers could be a bit more transparent about what is going on. They do have the QVL lists and all that but they advertise the max amount of RAM the board can support without mentioning its likely not obtainable at the speeds they advertise