What is DDR RAM?
DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers. It achieves greater bandwidth than ordinary SDRAM by transferring data on both the rising and falling edges of the clock signal (double pumped). This effectively nearly doubles the transfer rate without increasing the frequency of the front side bus. Thus a 100 MHz DDR system has an effective clock rate of 200 MHz when compared to equivalent SDR SDRAM, the 鈥淪DR鈥?being a retrospective designation. With data being transferred 8 bytes at a time DDR RAM gives a transfer rate of (memory bus clock rate) 脳 2 (for dual rate) 脳 8 (number of bytes transferred). Thus with a bus frequency of 100 MHz, DDR-SDRAM gives a max transfer rate of 1600 MB/s. JEDEC has set standards for speeds of DDR SDRAM, divided into two parts: The first specification is for memory chips and the second is for memory modules. Chip specification DDR-200: DDR-SDRAM memory chips specified to run at
Double-Data-Rate Synchronous Dynamic Random Access Memory, better known as DDR SDRAM or DDR RAM for short, is a type of very fast computer memory. DDR RAM is based on the same architecture as SDRAM, but utilizes the clock signal differently to transfer twice the data in the same amount of time. In a computer system. the clock signal is an oscillating frequency used to coordinate interaction between digital circuits. Simply put, it synchronizes communication. Digital circuits designed to operate on the clock signal may respond at the rising or falling edge of the signal. SDRAM memory chips utilized only the rising edge of the signal to transfer data, while DDR RAM transfers data on both the rising and falling edges of the clock signal. Hence, DDR RAM is essentially twice as fast as SDRAM. RAM speed works in conjunction with the front side bus (FSB) of a computer system. The FSB is the two-way data channel that sends information from the central processing unit (CPU) throughout the mothe
DDR SDRAM (double-data-rate SDRAM): DDR SDRAM is similar to SDRAM, but it transfers data on the rising and falling edges of the system clock, theoretically doubling the speed of SDRAM. Though DDR SDRAM was originally developed for graphics cards, desktop PC manufacturers now use it as system memory as well. DDR SDRAM is is not compatible with older systems. If you want to upgrade your RAM to DDR SDRAM, your PC’s motherboard needs to support 184-pin DIMM slots, and your processor must be fast enough to handle the extra bandwidth (A Cpu with a FSB of 800mhz(200mhz quad pumped) is recommended to run DDR pc3200 otherwise called DDR400mhz); otherwise, all that speed just goes to waste. PC2700 – 2.656GB/s bandwidth (8 x 166 x 2), runs at DDR-333mhz and PC3200 – 3.200GB/s bandwidth (8 x 200 x 2), runs at DDR-400mhz.
