Different plate types:
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B660 is ATX (30.5cm×24.4cm),
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B660M is MATX (24.4cm×24.4cm or 24.4cm×22.5cm)
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Memory slots are different: the B660 has 4 memory slots, generally 2 full-length PCI-E, 2 to 3 PCI-E x1, 2 to 3 M.2;
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B660M Due to the small motherboard area, depending on the product positioning has 2 or 4 memory slots, 1 to 2 full-length PCI-E, 1 PCI-E x1, 1 to 2 M.2; Both SATA interfaces are basically four.
The difference is as follows:
1. From the point of view of performance parameters, mortar WIFI and heavy gun WIFI are almost two motherboards carved out of the same mold, but they are slightly different in subtle aspects
2.B660M heavy gunner WIFI is better than B660M mortar WIFI in terms of hardware compatibility for future higher technologies.