I build a PC back in February and have been having issues with my RAM timings. I got 4 identical Corsair Dominator DIMMs a 16GB 3200mhz 16-18-18-36 installed on the Motherboard, using a Ryzen 7 3800x . However, as you can see from the screenshots, I have been unable to run the RAM at 3200mhz.

https://imgur.com/a/7li57KV

The best the PC can handle is 2866mhz, if I go any higher the boot will fail. If I enable the DOCP Standard Profile, the boot fails as well. The BIOS is on its most up-to-date version. I tried running the same setup with only two DIMMs but I'm running into the same issue there as well. I tried bringing up the RAM voltage to 1.35V, with no difference in terms of speed.

What can I do to make the RAM run at its advertised 3200mhz? Is it possible that the CPU is the bottleneck? I did stress test the RAM with no issues at 2866mhz, so I doubt its a faulty DIMM, which is why I am here and not the Corsair subreddit. I also feel I exhausted my research on the Asus forum. Any help would be appreciated.

Title says it all. I had to replace some parts and these were the only available at Best Buy(I know how awful /sarcasm). Looking for the best performance RAM for the Crosshair VIII Hero and the 5800x combo. The machine sports a 3090 FE and I'm already OCing with POB and have resize BAR enabled. Just looking to maximize the machine.

I also plan in adding a PCIE4 nvme. Anyone know offhand if this MB will support 2x PCIE4, my guess is no so I may just leave it as is.

Motherboard: Asus Crosshair VIII Hero WiFi

CPU: 3900X

Cooler: Corsair 280mm AIO

RAM: Corsair 3600cl16

BIOS: Version 0702

Win 10 1903 w/ AMD Balanced or AMD High Performance

Max CPU frequency was about 4.2GHz but now I'm getting 4.512GHz on single threaded work loads.

When I got my motherboard I updated the BIOS and the AMD chipset in Windows 10 1903. I then went into the BIOS and set AI Overclock Tuner to D.O.C.P. Standard to get my memory to 3600MHz. After that, I noticed that my CPU was only getting to 4.2GHz when I would run either Cinebench R15/R20 or CPU-Z benchmark. It was happening with multi-threaded and single thread tests. (BTW, PBO doesn't work at all on this board/BIOS and it actually lowered my scores)

The way that I was able to fix it and get my RAM to the rated speed and timing was to go into the BIOS after I had set D.O.C.P. Standard and edit the memory frequency and timing manually. It was really easy. Here's what I did (all in the Extreme Tweaker tab in the BIOS):

1. Go into the BIOS after you've already saved and restarted with AI Overclock Tuner set to D.O.C.P. Standard

2. Change AI Overclock Tuner to Auto

3. Change Memory Frequency to your RAM's rated speed

4. Scroll down to DRAM Timing Control and click on that

5. "Hardcode" the values that you see in the column into the far right column. (I left Trcpage on Auto)

6. Set everything from ProcODT (the first dropdown option) all the way down to Auto

7. Click Exit and then Save Changes & Reset.

That's how I got my RAM at it's rated speed and gained some significant single threaded speed.

Bonus: Adding a negative voltage offset to keep your CPU cool.

1. Go into the BIOS and into the Extreme Tweaker section

2. Scroll down to CPU Core Voltage and select Offset mode

3. The dropdown menu CPU Offset Mode Sign will appear under CPU Core Voltage. Select the negative sign "-"

4. For CPU Core Voltage Offset put in either .1 or .075 (.1 will keep it cooler but may limit boost clocks a TINY bit)

5. Click Exit and then Save Changes & Reset.

I have a query about ram speeds on my motherboard. I have an Asus ROG Crosshair VIII Hero, BIOS version 3801 x64. CPU is a Ryzen 3900x.

I'm running Unraid and after a system crash, I've been advised to clock back my ram by the Unraid team as it's known to cause parity issues with the Unraid system. I was advised to clock it back to 2167, I presume this was a typo and it should be 2166Mhz.

I have 64GB of ram in this machine. On the BIOS "main" screen it shows Total memory of 64GB & a memory frequency 2666Mhz.

The two packs of ram were bought separately. As in I got 2 x 16 and then another pair a few months later. This is the exact spec of what I bought.

32GB (2x16GB) Corsair DDR4 Vengeance LPX Black, PC4-28800 (3600), Non-ECC Unbuffered, CAS 18-22-22-42, 1.35V

In the BIOS under "Extreme Tweaker" I've left everything to "auto' except I've changed the memory frequency to "DDR4-2666Mhz". The system boots and is stable in Unraid.

My query is when I visit the BIOS and go to "Tool / ASUS SPD Information" the ram speeds are different.

• Slot A1: 2666Mhz

• Slot A2: 2133Mhz

• Slot B1: 2666Mhz

• Slot B2: 2133Mhz

Why are A2 and B2 running below the set speed? It's bad enough I've had to clock down from 3200Mhz for OS stability but if there is still speed to be gained from slot A2 and B2 I would rather have them running at 2666Mhz.

Can anyone advise?

Hi Guys,

I just purchased a crosshair VIII Hero X570 MB and was wondering if the following Ram would work:

https://www.newegg.com/corsair-32gb-288-pin-ddr4-sdram/p/N82E16820236454?Item=N82E16820236454

I'll be using this MB with a Ryzen 3900x cpu.

Any input would help.

Thanks

[SOLVED] Hello, I am a bit lost on how to get my ram to the optimized speed and timings. My ram is G.Skill trident z neo rgb ddr4 3600 cl16 memory, and I am trying to reach those advertised specs. The ram defaulted to 2133 mhz out of the box so I increased the frequency manually to 3600mhz in the bios, but then there was another problem, the CAS latency shot up to cl26, and am trying to find out how to fix it while keeping my ram at 3600mhz. Does anyone have any suggestions?

Edit: I managed to reach the advertised specs by enabling the D.O.C.P profile.