DDR comes in several versions including DDR2, DDR3, and DDR4, which offer better performance and are more energy efficient than DDR. The oldest type is known as single data rate (SDR) DRAM, but newer computers use faster dual data rate (DDR) DRAM. DRAM: DRAM stands for Dynamic RAM, and it is the most common type of RAM used in computers.When the data is no longer required it is shunted out to slower but cheaper secondary memory, and the RAM space that has been freed up is filled with the next chunk of data that is about to be used. It is because of the relative high cost of RAM compared to secondary memory types that most computer systems use both primary and secondary memory.ĭata that is required for imminent processing is moved to RAM where it can be accessed and modified very quickly, so that the CPU is not kept waiting. The most important things to understand about RAM are that RAM memory is very fast, it can be written to as well as read, it is volatile (so all data stored in RAM memory is lost when it loses power) and, finally, it is very expensive compared to all types of secondary memory in terms of cost per gigabyte. Or, put another way, any random bit of data can be accessed just as quickly as any other bit. The acronym RAM stems from the fact that data stored in random access memory can be accessed – as the name suggests – in any random order. Let’s look in-depth at both types of memory. There are two key types of primary memory: Over several periods of computer evolution, a wide of array of computer memory types has been deployed, each with its own strengths and weaknesses. The cost per gigabyte of secondary memory is much lower, but the read and write speeds are significantly slower.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |