Newbie - X470D4U / ryzen 3700X : RAM (CT16G4DFD832A x 2) is running at 2400 MHZ


New Member
Jul 31, 2020
Hi * .
The board is running fine so far .
What puzzles me it that I saw on bios it was running @ 2666 MHZ and now is @ 2400 MHZ .
RAM is supposed to run @3200 MHZ but it doesn't .
dmidecode lists :
Handle 0x001A, DMI type 17, 84 bytes
Memory Device
Array Handle: 0x000F
Error Information Handle: 0x0019
Total Width: 64 bits
Data Width: 64 bits
Size: 16384 MB
Form Factor: DIMM
Set: None
Locator: DIMM 1
Bank Locator: P0 CHANNEL A
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 3200 MT/s
Manufacturer: Unknown
Serial Number: E35E0926
Asset Tag: Not Specified
Part Number: CT16G4DFD832A.M16FJ
Rank: 2
Configured Memory Speed: 2400 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: DRAM
Memory Operating Mode Capability: Volatile memory
Firmware Version: Unknown
Module Manufacturer ID: Bank 6, Hex 0x9B
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: 16 kB
Cache Size: None

I fail to see what bios config to use to try to "manage" this issue .

Thanks !


New Member
Jul 31, 2020
Well, it was just play which ram on which socket .
The manual doesn't helped here .

RAM speed is running @ 3200 MHZ.


Active Member
Nov 25, 2016
First way:

BIOS -> Advanced -> AMD CBS -> UMC Common Options -> DDR4 Common Options -> DRAM Timing Configuration -> (Accept the risks to access menu) -> Memory Clock Speed: From “Auto” to 1333MHz for DDR4-2666, for example.

Second way:

BIOS -> Advanced -> AMD Overclocking -> (Accept the risks to access menu) -> DDR and Infinity Fabric Frequency/Timings -> DDR Frequency and Timings -> DRAM Timing Configuration