WHAT IS RAM?

RAM stands for Random Access Memory, and acts as a computer’s short-term memory. It stores data from multiple open programs and makes the data readily available for use (this is why you can switch between a word document to the internet browser to a minesweeper game immediately). RAM varies by capacity and speed.

Our logo was inspired by a ram.

WHAT TYPES OF RAM ARE FOUND IN COMPUTERS?

SDRAM (Synchronous Dynamic): SDRAM can accept one command and carry one word of data per clock cycle SDRAM have a synchronous interface so it depends on the computer clock signals to perform operations. SDRAM speeds are typically 100 and 133 MHz.

DDR (Double Data Rate): DDR RAM is capable of memory transfer data on both the rising and falling edges of the clock signal, giving it the capability to move information nearly twice as quickly as with regular SDR SDRAM. The prefetch buffer of DDR is 2 bit. DDR1 clock speeds range between 200 MHz (DDR-200) and 400 MHz (DDR-400). DDR-200 transfers 1600 MB/s, while DDR-400 transfers 3200 MB/s.

DDR2 (Double Data Rate 2):
DDR2 RAM memory is twice as fast as DDR due to improved bus signal, therefore twice as much data is transferred to the module for each clock cycle. Furthermore, DDR2 spends less power (1.8V) when compared to the DDR (2.5V). DDR2 speeds range between 400 MHz (DDR2-400), 800 MHz (DDR2-800) and 1066 (DDR2-1066). DDR2-400 transfers 3200 MB/s. DDR2-800 transfers 6400 MB/s. DDR2-1066 transfers 8533 MB/s.The prefetch buffer of DDR2 is 4 bit.

DDR3 (Double Data Rate 3):
DDR3 RAM memory is twice as fast as DDR2, therefore DDR3 speeds range between 800 MHz (DDR3-800), 1600 MHz (DDR3-1600) and 2133 MHz (DDR3-2133). DDR3-800 transfers 6400 MB/s; DDR3-1600 transfers 12800 MB/s and DDR3-2133 transfers 17066 MB/s. The prefetch buffer of DDR3 is 8 bit. Power utilization is further reduced so operating voltage is 1.5V. Furthermore, DDR3 has two new functions, ASR (Automatic Self-Refresh) and SRT (Self-Refresh Temperature) which can make the memory control the refresh rate according to the temperature variation.

DDR4 SDAM (Double Data Rate 4): Again, DDR4 RAM memory is twice as fast as DDR3 and power consumption is reduced to 1.2V. DDR4 speeds range between 2133 MHz (DDR3-2133) and 4266 MHz (DDR3-4266). DDR3-800 transfers 17066 MB/s and DDR4-4266 transfers 34133 MB/s. DDR4 also adds four new Bank Groups technology and adds some functions, such as DBI (Data Bus Inversion), CRC (Cyclic Redundancy Check) and CA parity.

As we move on from DDR to DDR4, each generation of DDR transfers twice as much data per clock cycle but is smaller and consumes less voltage, letting you have more RAM for the same power utilization on the same size module.