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"Asus Prime 450M-A” does not recognize the 4th slot of Vengeance memory

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Help! The motherboard “Asus Prime 450M-A” does not recognize the 4th slot of memory.

I have 4x 8 GB DDR4 memory pieces of “Vengeance LPX RED” (CMK8GX4M1A2400C16R) which run at 2400 MHz. In total those are 32 GB.

However, only 3x of the 8 GB memory pieces are accepted. The BIOS does not even appear if I tried to boot with 4x pieces of RAM.

· According to what I know, the motherboard should accept up to 64 GB of RAM.

· The latest bios update has been flashed (3202, Version 3202).

· I have randomly swapped the memory pieces. They all work ok, but the system does not run if I put 4 inside. The PC only boots with 3 slots occupied. It does not matter which one. By trial and error I tried all slots.

Here is some data:

  • Processor: AMD Ryzen 7 3700X 8-Core Processor (16 CPUs), ~3.6GHz

  • GPU: AMD Radeon RX 5600 XT

  • Motherboard: Asus Prime B450M-A

  • OS: Windows 10

I attach screenshots of Thaiphoon Burner:

There is a difference in

  • MEMORY MODULE: JEDEC DIMM Label, organization, Revision / Raw Card

  • DRAM COMPONENTS: Manufacturer, Part Number, Composition


Some photos:

Why can I add 3 pieces, but not four, although my motherboard should accept the memory?

There is even a different version number on the sticks:


Thank you!

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  • Corsair Employees

The DIMMs are not meant to be used in the same system.  Each DIMM is considered a separate kit and when used in the same system may cause the issues you are seeing.

Typically, 2 DIMMs you will be able to get away with but usually not 4.

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