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.

Dedicated Memory Slot Means -

I have a AMD System and I have come across many online posts regarding increasing the Dedicated and Total Memory. Here are my specs: A10-9600p Quad-Core. 2.4GHz Base speed Turbo to 3.4GHz. Dual Channel 6GB of RAM. Radeon R5 Graphics - 384MB Dedicated - with up to 3247Mb of total Graphics Memory - System Video Memory is 0MB - Shared System. There are some motherboards offering the option of both DDR3 and DDR 4 memory slots, but you get half as many as you would on a board with dedicated slots for one type i.e. You would have two slots which support DDR3 and two slots which support DDR4 instead of having four slots capable of accepting DDR4 memory.

Dedicated Memory Slot Means Free

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.

Dedicated Memory Slot Means Quick

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.