MSI X299 TOMAHAWK AC
Board code MS-7B05 Motherboard, from 2018 3 hardware reports
Memory
Up to 64 GB
8 full-size slots
SSD slots
Coming next
Checked from separate sources
Upgradable
Yes. 8 slots, up to 64 GB seen working.
It takes DDR4-3400 full-size sticks (DIMM).
- Slots
- 8 DIMM slots
- Type
- DDR4-3400 288-pin DIMM
- Most seen working
- 64 GB in two or more machines
- Firmware says
- 1536 GB maximum (often wrong, so we show what machines run)
- How sure
- 3 of 3 reports show this layout
See 8 GB DDR4-3400 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 3 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 X299 TOMAHAWK AC?
Yes. 8 slots, up to 64 GB seen working. It takes DDR4-3400 full-size sticks (DIMM).
What type of RAM does the MSI X299 TOMAHAWK AC use?
DDR4-3400 full-size sticks (DIMM, 288-pin).
How much RAM can the MSI X299 TOMAHAWK AC take?
Machines in the reports run up to 64 GB. The firmware reports a maximum of 1536 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 X299 TOMAHAWK AC or MS-7B05.