Motherboard and memory module

A motherboard, comprising:

• a memory module, comprising:
• a first memory rank;
• a second memory rank;
• a plurality of first pins, coupled to the first memory rank;
• and
• a plurality of second pins, coupled to the second memory rank;
• a processor, comprising a memory channel;
• and
• a memory slot, coupled between the processor and the memory module, and configured to transmit a first control signal from the memory channel to at least one of the plurality of first pins, or transmit a second control signal from the memory channel to at least one of the plurality of second pins,
• wherein the memory module is inserted in the memory slot,
• wherein the first memory rank receives the first control signal through at least one of the plurality of first pins, and the second memory rank receives the second control signal through at least one of the plurality of second pins,
• wherein the first control signal is transmitted from the processor to the memory slot through a first signal transmission path, the second control signal is transmitted from the processor to the memory slot through a second signal transmission path, the first control signal is transmitted from the memory slot to the first memory rank through a third signal transmission path, and the second control signal is transmitted from the memory slot to the second memory rank through a fourth signal transmission path,
• wherein a difference between a length of the first signal transmission path and a length of the second signal transmission path is X mil, a length of the third signal transmission path is M mil, a length of the fourth signal transmission path is N mil, and the length of the fourth signal transmission path is expressed through a formula as follows:
• N=M−X+J
• wherein X, M, N and J are positive numbers, and J is less than or equal to 500.