Board Layout

MSI, like any sensible manufacturer is moving with the current market. Motherboards, like every other consumer product shifts with current trends and is dropping the RGB glory that is often associated the "gamer vibe" in favor of a more stylish presentation, while still keeping some elements like RGB lighting, just less "in your face." This shift overall has a wider appeal, first seen with MSI AMD X570S chipset refresh in 2021.

Similar to a fair number of AMD X670E based motherboards, the size has increased here as well. While not a requirement to use this larger E-ATX format, many motherboard vendors are dealing with space being restricted, due to the dual X670 chipset taking up precious real estate. The downside of using this E-ATX form factor is it will have an impact when it comes to choosing a computer case. Installation of E-ATX motherboards often come with challenges due to the extended width. Along with a new, paired chipset, the CPU socket has physically changed. Together with firmware and design changes, this also physically prevents previously released Ryzen CPUs (Zen1, Zen2, Zen3) from being installed, which will not be compatible moving forward.

Flipping it around, we can see that the entire back is covered by a backplate designed to relieve stress in a uniform manner, and provide additional cooling using thermal pads sandwiched in between. This isn't just for show, serving a purpose outside of being a hazard guard.


AMD's changes to the socket also comes with some compatibility challenges as well. Many brands currently selling AM4 CPU coolers already have forwards compatibility, but not all will work. What changed is the backplate, which was previously removable for the AM4 (PGA) socket, and is now an integral part of this new AM5 (LGA) socket. This means any cooler that has its own backplate as part of the installation will be incompatible, unless a an adapter is available from the manufacturer.

MSI does an excellent job here allowing for maximum cooler compatibility in terms of physical restraints dealing with height and width. The surrounding VRM heatsinks are quite tall, which can the restrict air-cooler orientation. However, they are far enough away from the socket to not interfere with the majority of AIO coolers on the market.

Note: AMD recommends 240-280 mm AIO (or better) for the Ryzen R9 7950X/7900X to keep the turbo frequency on target. Thermal observations from using the AMD Ryzen 7950X during this review place the CPU at 95°C, which is perfectly normal. The AIO solution isn't a requirement if heavy multi-threaded application performance is a priority, though it will provide the highest boost clocks overall. Undervolting and using PBO is also an option, to circumvent CPU cooler thermal limitations. For more information regarding Ryzen 7000 cooling requirements, TechPowerUp has a great article covering this specific topic. Article Link.


The MSI MEG X670E ACE offers three PCI Express x16 slots, with all three being reinforced for extra stress support. Each slot is PCIe Gen 5 certified, with a total of 20 (16+4) lanes coming from the CPU. PCIe slot one can either operate at x16 or x8. Slot 2 is wired for PCIe Gen 5 x8 and will split the available lanes with the first slot when populated. The third slot has the wiring for Gen 5 x8 as well, but is limited to x4 mode. It is unclear whether future CPUs will allow for the full x8 bandwidth. For the Ryzen 7000 series at least, this third PCIe slot will not operate above Gen 5 x4. When this third slot is also occupied, one of the USB-C 20 Gbps ports on the rear IO is disabled due to sharing the same PCIe lanes, so it cannot be used simultaneously.


After removing the heatsink, we can get a closer look at the X670E chipsets in tandem (PCH).


Between the PCIe slots is three Gen4 x4 M.2 sockets. These all have heatsinks as well that provides passive cooling.


Next to the memory DIMM slots is a single M.2 socket. This is the only Gen 5 x4 M.2 socket on the motherboard itself, but also does not require screws for the heatsink. This heatsink latches from the top, which is extra convenient for installation of NVMe drives, as it is not stuck below a graphics card.



Included with the MSI MEG X670E ACE is a M.2 add-on card named "M.2 Xpander-Z." This supports two Gen 5 M.2 with sizes up to M.2 25110. The card is designed around maximum cooling, with large heatsink and fan in the middle. This is great to see and will be extra important as the first generation of Gen 5 M.2 SSDs are expected to be exceptionally warm and potentially could thermal throttle during large file transfers if not properly cooled.



MSI didn't just make a simple M.2 add-on card, rather it has thermal sensors and additional headers that can be connected to the motherboard, allowing for fan control and showing hard drive access stats from the case panel itself. If you do not want to connect the extra cables, the card will still function, as long as it has power through the 6-pin PEG connector. The front of the card has two blue lights, each of which indicates one M.2 SSD is installed. Next to that is an array of LEDs that change colors based on the temperature from the thermal probes, both of which can be turned off with switches on the card itself.


A quick look at the bottom M.2 heatsink. MSI has a contact connection for the RGB lighting and power instead of having wires that could potentially be ripped out of the connector If you are not careful during disassembly. A nice little addition the MEG X670E ACE has going for it.


In the bottom right corner of the motherboard is the power and reset button. The reset button can be reprogrammed in the BIOS to turn off the MSI Mythic lighting, or as a safe boot instead of the default reset function.


The MSI MEG X670E ACE includes a post code debugger and startup LEDS for easier troubleshooting. Considering that the AM5 socket is new to everyone, it is always good to get a readout of what stage the boot process is on, or what it may be stuck on. First boot after clearing the CMOS or installing new memory will take anywhere from two to six minutes, depending on the configuration.


MSI has included V-Check read points. These can be helpful for a quick diagnostics of the voltage for Vcore and SoC. It is not necessary to have these available when overclocking, but it is appreciated when software readings are inaccurate.


Below the third PCIe slot is the BIOS and LED switches. Besides that is a special header for the optional tuning controller. Unfortunately this controller is not something you can buy separately, and only comes with select overclocking motherboards.


Hidden behind the Rear-IO panel is the Marvell AQC113CS-B1-C 10Gb LAN.


Among the many headers sprawled across the bottom is the water flow meter and the thermal sensor connector to be used with the thermistor cable (included).


The MSI MEG X670E ACE uses a two 8-Pin EPS connector for higher power management. Next to the 24-Pin is an extra 6-Pin PEG to supply additional power to USB peripherals, M.2 sockets and PCIe slots.


In two places on the bottom and near the LED debug lights is the RGB headers for a total of four. A single 12 V (4-pins) next to the audio section and three ARGB 5 V (3-pins) header in various places.

Information provided by MSI MEG X670E ACE manual


One of the major differences you'll see between the X670 and B650 chipset is the amount of internal USB headers and external high-speed connections. This is because the B650 only has one chipset, with less overall PCIe lanes available to be allocated towards SATA ports, USB and PCIe slots. With the MSI MEG X670E ACE, we get two USB 3.2 Gen 1 (5 Gbps), USB-C 20 Gbps and a second USB-C 10 Gbps internally placed on the motherboard. Two additional USB 2.0 headers are spotted as well.


Each X670 PCH can supply up four 6 Gb/s SATA ports natively. Here we can see MSI has used a 4 + 2 Configuration. These additional two 6 Gb/s SATA ports are attached to a ASM1061 controller and do not support the RAID function.


MSI has used the Realtek ALC4082 Codec + ESS ES9280AQ Combo DAC/HPA Codec for it's on-board audio solution. This supports up to 32-bit/384kHz playback.


A closer inspection of the Rear IO panel reveals quite a lot of USB 3.2 Type-A 10 Gbps ports (RED). MSI has done an excellent job of labeling these ports for quick identification, with a small number next to each. Since all Ryzen 7000 (X) CPUs (currently) support onboard graphics, among these is three USB-C ports, one USB-C is secretly doubling as a DisplayPort for the onboard graphics, if needed. The other two are rated for 20 Gbps, with one of those actually sharing the bandwidth with the 3rd PCIe slot, and will not be active if the slot is populated. Along with the high speed USB ports is a 10 Gb LAN and WiFi 6E for networking.

Moving along, MSI has included a Clear CMOS button for when the overclock has locked the system up and it becomes necessary to revert back to stock settings, without needing to remove the battery. Next is the BIOS Flashback button which allows the motherboard BIOS to be flashed without a processor present. This feature is built into the AM5 platform, so there's no reason for manufacturers not to take advantage of it. Lastly is the Smart Button. This is a multi-key button that can be configured to Reset the system, turn Mystic Lights on/off, Turbo Fan Mode or as a Safe Boot button. The Safe Boot has some issues on AMD platforms. From trial and error, using the function is good for safe booting if the EXPO memory configuration does not work. However, some BIOS voltage settings cannot be recovered from, and must be resolved by clearing the CMOS.

• 1x Clear CMOS button
• 1x Flash BIOS button
• 1x Smart button
• 2x USB 3.2 Gen 2x2 20 Gbps Type-C port
• 1x USB 3.2 Gen 2 20 Gbps Type-C port (Display Alt)
• 8x USB 3.2 Gen 2 10 Gbps Type-A ports
• 1x 10GbE LAN (RJ45) port
• 2x Wi-Fi antenna connectors
• 5x OFC audio jacks
• 1x Optical S/PDIF out connector