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Asus - PRIME B450M-A/CSM Micro ATX AM4 Motherboard

( 4.7 Average / 12 Ratings )




Part #



Black / Silver

Form Factor

Micro ATX

CPU Socket



AMD B450

Memory Slots

4 x 288-pin DIMM

Memory Type

DDR4-2133 / 2400 / 2666 / 2800 / 3000 / 3200

Maximum Supported Memory

64 GB

RAID Support


Onboard Video

Depends on CPU

CrossFire Support


SLI Support


SATA 6 Gb/s


Onboard Ethernet

1 x 1000 Mbit/s

Onboard USB 3.0 Header(s)


Completed Builds Using This Part

See All Completed Builds


Prices for this part are not available.

Price History (Excluding Tax) History:


Biggerboot 8 points 6 months ago
from completed build Dark Link

Was really easy to set up and plays with RAM very nicely. Like the graphics on the pcb too.

arnels04 18 points 4 months ago
from completed build 1st Gaming PC Build

Easy to build on and provides all of the features i was looking for! No update required either, ready to go right out of the box.

Rsd95 10 points 4 months ago

There aren’t many options for micro-ATX AM4 boards, so competition is slim. But this board has been working well for me so far. Easy overclocking (although I’ve only overclocked RAM with it so far) and overall typical ASUS quality. Two fan headers, an RGB header, M.2 support, and 6 SATA ports (although worth noting that SATA ports 5 & 6 are disabled if you are using the M.2 slot).

Update: I was having boot issues. If I would shut down and then turn back on without cutting power at all (normal shut down, not a restart, and leaving the PSU on), the system would hang on the POST screen until I hit restart on the case, then turn on. But, updated to the latest BIOS and this issue is gone.

gbch 8 points 3 months ago
from completed build Black Friday HTPC

I don't have the knowledge to judge the quality of a motherboard, however I am disappointed Asus doesn't provide a utility to patch a fix into USB Windows 7 installations. MSI and Asrock provide such tools and this board replaced a used Asrock board that ended up being DOA. The board has an 8 pin for the CPU but the case's included PSU only has a 4-pin. Since I'm not overclocking, the 4-pin connected to the 8-pin slot is working just fine.

oblivionofficial 6 points 3 months ago
from completed build Momstation

Good for a budget Ryzen build. Asus motherboards are always my favorite. I/O is wonderful, and front header USB 3.0 support is included as well.

AstroVelasco 10 points 2 months ago
from completed build I Should Be Studying

As a first time builder, this seemed great to work with. The manual makes that part easy enough, and there's really nothing negative I can say about it. There was a point where I felt that perhaps at this price point there may be better boards out there, but for a deal, this does exactly what it needs to.

TwystedZang 10 points 2 months ago
from completed build Entry Level Sleeper Build

Motherboard: The Asus PRIME B450M works perfectly with the case I chose. My only complaint is the yellow LEDs, although I know they can be shut off in the BIOS. This board gives me space for RAM upgrade ability in the near future.

i5le 3 points 1 month ago

Great inexpensive motherboard for my first build. Simple layout, 4 DIMMs, AURA RGB control, easy BIOS and overclocking, and a B450 chipset for less than $85 is a no-brainer. Easy installation of everything and the black design looks beautiful. My only complaint is that the manual wasn't as helpful as I expected.

Bitl 12 points 1 month ago
from completed build PROJECT SOMBRA

High quality budget motherboard with future upgradability! Wish you could change the color of the lights on it though.

Jcw93 10 points 1 month ago
from completed build PhlegmaticCulture

This is an excellent motherboard! Everything works well and was/is super easy to setup! Search function is very helpful because some of the options do seem a bit buried.. only because there’s so many options! Asus AURA works with 4 pin LED. Great board and competitively priced.