Facts ,What is memory?




Facts | What is memory?

Recently, we learned about how to construct the random access memory (RAM, RAM), and why it is called random access memory. Today it’s time to talk about her classes. Performance memory depend not only on its size but also on the characteristics of the chip design. We list the most common types of random access memory and talk a little bit about the terms that are not always clearly perceived by users.

When it comes to RAM, it should be guided in terminology. Random access memory (RAM) is, strictly speaking, a random access memory. RAM on the Russian language most often translated as “memory.” But there is an important subtlety: a RAM we often understand the system memory to a computer or other computing device. System memory chips based on the technology of dynamic random access memory. But the memory of this category is used for other tasks.

SRAM: Static random access memory. Each of her cell contains several transistors are usually from four to six. This capacitor is not contained in each cell. It is used mainly in the cache, which our readers already know .

DRAM: Dynamic Random Access Memory. Each cell contains a pair of her: a transistor and a capacitor. Her need to constantly update.

FPM DRAM: Dynamic memory with fast sequential access within a page. Is a form of DRAM. If desired bits are arranged in a single row, the row address is given only once. In the future, specify only the column address. Pages in this case is called a string. Data rate of the second cache level (L2) can be up to 176 megabits per second.

EDO DRAM: Dynamic memory with increased data availability. She did not have to wait for the completion of processing of one bit of data in order to appeal to another. As soon as the first bit of the address is set, EDO DRAM begins to search for the next. This memory is about 5% faster than discussed above FPM DRAM. Data of the second level cache can be speeds up to 264 megabits per second.

SDRAM: Synchronous dynamic memory. Operates at high speed. The fact that the data processor is often required in the order in which they are arranged in rows. Therefore SDRAM, referring to a particular line, it reads bits (located in different columns) in order. SDRAM about 5% faster than EDO RAM. Transmit data of the second level cache with it could speed up to 528 megabits per second.

DDR SDRAM: It SDRAM Double Data Rate. In fact it is the same SDRAM with a wider bandwidth. The maximum data rate of the second-level cache is 1000 064 megabits per second. It is a question of DDR SDRAM with a speed of 133 megahertz.

RDRAM (Rambus dynamic random access memory): It differs from all previously considered types of random access memory. In developed by Rambus RDRAM memory is used inline memory module Rambus (RIMM, Rambus in-line memory module), which is the size and configuration of the standard is similar to the findings of the DIMM.

This special type of memory does it use a special high-speed data bus called the Rambus-channel. RDRAM memory chips work in parallel. Baud rate reaches 800 MHz or 1 thousand 600 megabits per second. But there is a downside: as the memory runs at such a high speed, and it generates more heat. Therefore, Rambus chips are supplied heat spreaders that look like long, thin plate. By analogy with the “notebook” modules DIMM, for laptops up smaller versions of SO-RIMM.

CMOS RAM (CMOS memory): a small amount of memory, which is contained in computers and other “computer-like” devices. It stores parameters such as, for example, setting the hard disk. To maintain it takes a little battery, which is located on the motherboard of the computer. After all, memory, unfortunately, is volatile. The fact that different non-volatile memory from the volatile enough detail discussed during consideration of the hierarchy of computer memory.

VRAM (VideoRAM, video RAM): Also known as MPDRAM (Multiport dynamic random access memory, multiport dynamic random access memory). This type of memory is used to display adapters and 3D-akselleratorah. “Multiport” as it is called VRAM has two independent access ports instead of one, as is usually the case. This allows the CPU and GPU at the same time have access to this type of memory. Memory capacity is a factor determining the resolution and color depth of the display.

VRAM is also used for storing a special kind of information related to the graph. Obvious examples of such information include three-dimensional geometric data and texture maps. But true multiport VRAM is not cheap, so you can often still be found SGRAM (synchronous graphics random access memory). Its performance is close to the VRAM, and the price is lower.

Next time we’ll talk about what’s inside your RAM module.

To be continued …

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