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Slots
This is the total number of memory upgrade slots (sockets) followed by their configuration. Banks are the way a system addresses memory. A bank must be completely filled with memory modules of the same size and type in order for the system to recognize and address the memory. i.e. :
3 (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 3 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
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So if you get 2 x 8GB sticks and slot correctly will run in dual cahnnel. The potental issue is if 16GB is not enough. It is impossible to tell when that day will come. So buying a 2 slot Motherboard now may be saving you money now. If 16 GB is not enough then you need to get new memory completely. With 4 slots, just buy more memory if needed. Most mobos work like this: 2 ram sticks go in slot 2 - 4 if you have 4 sticks put em all in. My msi manual told me to put it in slot 2 - 4 too akd iv got 8gbs in 2 sticks. Plus its a commen way of indtalling ram since it uses dual channel.
4 (2 banks of 2) This indicates that there are 4 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
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12 (3 banks of 4) This indicates that there are 12 memory slots. These are divided into 3 banks, and each bank consists of four memory slots. So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.