recently published an update (translated) to an article outlining the differences between AMD’s AM4 motherboard chipsets. As it stands, the X370 and B350 chipsets are set to be the most popular chipsets for desktop PCs (with X300 catering to the small form factor crowd) especially among enthusiasts. One key differentiator between the two chipsets was initially support for multi-GPU configurations with X370. Now that motherboards have been revealed and are up for pre-order now, it turns out that the multi-GPU lines have been blurred a bit. As it stands, both B350 and X370 will support AMD’s CrossFire multi-GPU technology and the X370 alone will also have support for NVIDIA’s SLI technology.

The AM4 motherboards equipped with the B350 and X370 chipsets that feature two PCI-E x16 expansion slots will run as x8 in each slot in a dual GPU setup. (In a single GPU setup, the top slot can run at full x16 speeds.) Which is to say that the slots behave the same across both chipsets. Where the chipsets differ is in support for specific GPU technologies where NVIDIA’s SLI is locked to X370. TechPowerUp speculates that the decision to lock SLI to its top-end chipset is due, at least in part, to licensing costs. This is not a bad thing as B350 was originally not going to support any dual x16 slot multi-GPU configurations, but now motherboard manufacturers are being allowed to enable it by including a second slot and AMD will reportedly permit CrossFire usage (which costs AMD nothing in licensing). Meanwhile the most expensive X370 chipset will support SLI for those serious gamers that demand and can afford it. Had B350 supported SLI and carried the SLI branding, they likely would have been ever so slightly more expensive than they are now. Of course, DirectX 12's multi-adapter will work on either chipset so long as the game supports it.

  X370 B350 A320 X300 / B300 / A300 Ryzen CPU Bristol Ridge APU
PCI-E 3.0 0 0 0 4 20 (18 w/ 2 SATA) 10
PCI-E 2.0 8 6 4 0 0 0
USB 3.1 Gen 2 2 2 1 1 0 0
USB 3.1 Gen 1 6 2 2 2 4 4
USB 2.0 6 6 6 6 0 0
SATA 6 Gbps 4 2 2 2 2 2
SATA RAID 0/1/10 0/1/10 0/1/10 0/1    
Overclocking Capable? Yes Yes No Yes (X300 only)    
SLI Yes No No No    
CrossFire Yes Yes No No    

Multi-GPU is not the only differentiator though. Moving up from B350 to X370 will get you 6 USB 3.1 Gen 1 (USB 3.0) ports versus 2 on B350/A30/X300, two more PCI-E 2.0 lanes (8 versus 6), and two more SATA ports (6 total usable; 4 versus 2 coming from the chipset).

Note that X370, B350, and X300 all support CPU overclocking. Hopefully this helps you when trying to decide which AM4 motherboard to pair with your Ryzen CPU once the independent benchmarks are out. In short, if you must have SLI you are stuck ponying up for X370, but if you plan to only ever run a single GPU or tend to stick with AMD GPUs and CrossFire, B350 gets you most of the way to a X370 for a lot less money! You do not even have to give up any USB 3.1 Gen 2 ports though you limit your SATA drive options (it’s all about M.2 these days anyway heh).

For those curious, looking around on Newegg I notice that most of the B350 motherboards have that second PCI-E 3.0 x16 slot and CrossFire support listed in their specifications and seem to average around $99.  Meanwhile X370 starts at $140 and rockets up from there (up to $299!) depending on how much bling you are looking for!

Are you going for a motherboard with the B350 or X370 chipset? Will you be rocking multiple graphics cards?

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