Asus 870e Strix with DDR5 6000mhz

[kaybee123]

I have a brand new:
- Ryzen 9800X3D,
- Asus 870e-Strix motherboard
- G.Skill DDR5 6400mhz Trident Z Royal ram 32GB (2 x 16GB) 288-Pin PC RAM DDR5 6400 Model F5-6400J3039G16GX2-TR5S

The motherboard refuses to boot at any speed above the default 4800mhz in the bios. As soon as I set POC or increase the speed of the memory to anything above 4800mhz, it refuses to boot up.

- The motherboard is running the latest BIOS, Version 0606 (2024/11/05).
- The memory has been verified and stress tested for issues at 4800mhz (it works perfectly fine).
- Memory is installed in the recommended configuration A2,B2 channels.

I tested disabling the memory context as shown in another post, unfortunately, that didn't help the situation.

I tested setting the memory's recommended settings (timings/voltage) and then lowering the memory frequency to 5200, 5600, 6000mhz, none of these boot.
I tested relaxed memory timings, no boot.
I tested disabling fast boot, no change.

What's wrong here? Why does the system refuse to boot at anything other than the default bios settings of 4800mhz ?

[Nate152]

Hello kaybee123

The recommended configuration for two sticks of memory is slots A2-B2 (2nd & 4th slots from the cpu).

See how it goes with your memory in the A2-B2 slots.

[kaybee123]

Thanks and sorry, I mispoke, it IS in A2/B2 and has been since the start.

[Nate152 · Accepted solution]

Ok,

I'm not sure what timings you tried, but as a test, try this.

1) Enable EXPO in the bios.

2) Go to Dram Timing Control and set the primary timings to:

40

40

40

110

Command Rate -  2N

3) Hit F10 and Enter to save and exit.

How does this go?

[kaybee123]

Thanks, I only have DOCP (I'm assuming that's the same as EXPO) and I'll test the different timings.

[hydrus]

Hi, I can make a new topic if needed. I also have an 870e-e wifi gaming board, 9800x3d. Originally, I also had F5-6000J3040G32GX2-TZ5NR 2 x 32GB in the recommended channels. The computer would boot up but was unstable with stuttering after waking up from sleep or on random reboots with EXPO 1, 2, and tweaked enabled at 6000 MHz. I switched out the ram to Corsair CMP64GX5M2B6000Z30 2 x 32 GB. Expo 1 at 6000 MHz also causes the same stuttering, though from what I can tell it is less. I am going crazy trying to figure this out. Should I also start with the timings above? I am new to messing with the timings on RAM. From what I can tell the 9800 x3d only officially supports up to 5600 MHz so I don't even know if it can be run at that speed. Thanks for any help. 

[fpot]

Mate! I was having massive drams getting my RAM stable but this fixed it. Thanks so much I was really stressing about it.

[Nate152]

Yes Expo = DOCP

Sounds good, be sure to reset the bios to defaults first (hit the f5 key in the bios), then try the steps above.

[kaybee123]

Alright! Thanks. So I was able to set things to DOCP, then I went into the manual timings and set it to the slower CL 40 settings.

After 2.5 minutes, it booted! (I saw in another thread that sometimes you had to wait an abnormal quantity of time).

From there, I went step by step, revising the timings and slowly improving them until I had my CL-30, 39, 39, 39 and set the ram to 6000mhz. Now it runs great!

I was curious about the AMD memory sync as I heard that we want it to sync with the processor and that running it at higher speeds might not be faster. Right now I seem to have a 1:30 FSB: DRAM ratio. Is that what we are talking about?

Can I do 6200mhz or 6400mhz and still keep it in sync?

Is that the asynchronous/sync setting I saw in the bios ?

Thanks!