MSI X399 GAMING PRO CARBON AC
Board code MS-7B09 Motherboard, from 2017 11 hardware reports
Memory
Up to 128 GB
8 full-size slots
SSD slots
Coming next
Checked from separate sources
Upgradable
Yes. 8 slots, up to 128 GB seen working.
It takes DDR4-2933 full-size sticks (DIMM).
- Slots
- 8 DIMM slots
- Type
- DDR4-2933 288-pin DIMM
- Most seen working
- 128 GB in two or more machines
- Firmware says
- 512 GB maximum (often wrong, so we show what machines run)
- How sure
- 11 of 11 reports show this layout
See 16 GB DDR4-2933 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 11 hardware reports of this motherboard. Sources and method. Updated 9 Nov 2026.
8 full-size slots
Illustration Questions
Can I upgrade the RAM in the MSI X399 GAMING PRO CARBON AC?
Yes. 8 slots, up to 128 GB seen working. It takes DDR4-2933 full-size sticks (DIMM).
What type of RAM does the MSI X399 GAMING PRO CARBON AC use?
DDR4-2933 full-size sticks (DIMM, 288-pin).
How much RAM can the MSI X399 GAMING PRO CARBON AC take?
Machines in the reports run up to 128 GB. The firmware reports a maximum of 512 GB, a figure that is often wrong.
Is this my motherboard?
The model name is printed on the board, usually between the memory slots or near the CPU socket. In Windows, open System Information and look at "BaseBoard Product"; it should read X399 GAMING PRO CARBON AC or MS-7B09.