Memory on Module

Since lots of our members are not just only industry players but in finance/security field, sometimes it's hard for us to reply and explain everything in details about DRAM market one by one. So, we probably will take some paragraphs to do some basic introduction about DRAM market and so on- but on casual.

Bits and Bytes

Computer code uses machine language which uses only two numerals: 0 and 1. Different combinations of 0s and 1s form what are called binary numbers. Machine language used binary numbers to form instruction for chips and microprocessing devices that drive computing devices- such as computers, printers, hard disk drives.

Bit - A bit is the smallest unit of used by our computer and can be either a 1 or a 0.

Byte - A byte consists of 8 bits. Almost all specifications of our computer's capabilities are represented in bytes. For example, memory capacity-128Mbyte, data-storage capacity-20Gbytes.

Chip Density

Each memory chip is a matrix of tiny cells. Each cell holds one bit of information. The Density is how much information a chip can hold, like "128Mbit" or "16M by 8". A 128Mbit chip has 128 million cells and is capable of holding 128 million bits of data. The expression "16M by 8" describes l28Mbit chip in more detail by their cell organization. The first number indicates the depth of the chip (in locations) and the second number indicates the width of the chip (in bits). Multiplying the depth by width, you get the density of the chip. Examples- 64Mbit (4Mx16, 8Mx8 or 16Mx4); 128Mbit (8Mx16, 16Mx8, 32Mx4)

Module Capacity

A module contains several chips on it, usually in main memory module it has 8 chips on a module. Module capacity is described in Megabytes. So we have to convert bits to bytes. If there are 8 chips of 128Mbit on a module, then it is 1024Mbits. 1024Mbits/(8 bits per byte)=128Mbyte (In the industry, it's usually written as 128MB).

There is the other way of describing module as "16Mx64" (16 Meg by 64). In this case, you can calculate the capacity of the module exactly as if it is a chip. 16Mx64=1024Mbits. 1024Mbits/(8bit per byte)=128MB.