Was thinking of getting the ASRock AB350M Pro4 AM4 for my mATX build (Ryzen 1700). I plan to OC to about 3.5 GHz if that matters. Anyway, I think the ASRock board only has 1 PWM fan header... which I am not too thrilled with. So, I'm considering getting the MSI B350M AM4. However, I see there are two of these boards, a "regular" one and a "Mortar" one that costs about $15 more.
I cannot tell the difference for the life of me. Can anyone explain what's the difference? It seems like, maybe, the Mortar board is actually rated to accept RAM at 3200 MHz or above where as the "regular" one might work but isn't necessarily meant for it - I plan to get 3200 MHz RAM so that would be an important distinction for me. Also, maybe there are 3 PWM fan headers on the Mortar but only 2 on the regular? Any advice is appreciated.
Despite the PRO in the name the MSI B350M Gaming PRO is a bit bare bones. The Mortar is a bit more full featured. For instance:
The Pro only has 2 DIMM slots vs 4 for the Mortar.
The Pro only has one PCIe 16x connectors, the Mortar has two. Well, two 16x physical slots. The second one is only 4x speed but MSI claims the board can still support two way Crossfire.
The pro has a Realtek ALC887 audio chipset and three audio jacks, the Mortar has the more advanced Realtek ALC892 chipset with five audio jacks plus an optical S/PDIF Out connector.
There are also other small differences. One worth mentioning since you ditched the Asrock over fan headers: The Mortar has three 4-pin system fan connectors. The Pro has only two.