Showing results for 
Search instead for 
Did you mean: 

Better setup for OC G.Skill 4800mhz CL20-30-30-50

Level 7
Good morning,

I have the following setup:

MB: MB ATX Asus ROG Crosshair VIII Hero (Wi-Fi)
PSU: ATX Asus ROG Strix 850W 80 Plus Gold Full Modular
CPU Cooler: iCUE H100i H115i H150i Elite Capellix
CPU: AMD Ryzen 9 5900x
Memory Bios OC: D.O.C.P.
Bios Version: Last stable version 4006
RAM Memory Kit: G.Skill Trident Z RGB DDR4-4800 CL20-30-30-50 1.55V 32GB (2x16GB) - F4-4800C20D-32GTZR - F4-4800C20D-32GTZR - G.SKILL International Enterprise Co., Ltd.

Is it possible to reach 4800mhz with my setup above? What should I change?

Mobo accept setup even higher than 4800mhz OC.
I tried the standard D.O.C.P. profile and my computer keeps rebooting reporting as unstable configuration.

Standard D.O.C.P profile:
Voltage: 1.55v (1.53v at bios read)
Frequency: 4800mhz
Latency: 20-30-30-50

I was able to reach 4400mhz with the same configuration above, but benchmark reported 1 memory error and then I came down to 4333mhz.

I am currently using:
Voltage: 1.55v (1.53v at bios read)
Memory Frequency: 4333mhz
BCLK Frequency: 100.0000
FCLK Frequency: Auto (2166mhz at benchmark read)
Latency: 18-27-27-47
PowerDown: Disabled
BGS: Disabled
BGS Alt: Enabled
GDM: Enabled
VSOC: Auto (1.11v at bios read)

Memories are at slot B2 (16GB) and A2 (16GB) as specified at motherboard manual.

Is there something else that I could do to reach the 4800mhz having my system stable? Or any other configuration to have a better OC setup even bellow the 4800mhz?

Thank you in advance.

Super Moderator

Speeds above 4000MHz require Gear 2 which runs the Fabric Clock asynchronously. The best CPU performance is found running in 1:1 ratio with the FCLK (Fabric Clock). 4800 is also the maximum validated ratio for the Crosshair VIII. Even if wanting to run asynchronously with FCLK, I'd normally recommend buying a kit below the maximum validation for an easier time tuning.

I would aim for a tight 3600-3866 if the CPU will allow you.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090