What Is the Difference Between DDR, DDR2, DDR3 & DDR4 Video Memory?
One of the most common upgrades for a computer is its memory. The standards for memory are DIMM and RIMM memory with variations based on bus speed. DDR, DDR2, DDR3 and DDR4 are all speed variations.
DDR
DDR, or double data rate, memory is simply a memory chip that processes twice as many bits of data per clock cycle as a standard RAM chip. This allows twice as many calculations to be done, effectively doubling the computing power of the processor. DDR was available in 200 MHz, 266 MHz, 333 MHz and 400 MHz speeds.
DDR2
DDR2 is the second version of DDR memory. It requires less power -- 1.8 volts as compared to the DDR's 2.5 volts. It also comes with a different form factor which means that it is not usable in motherboards designed for DDR. DDR2 was available in 400 MHz, 533 MHz, 667 MHz, 800 MHz and1033MHz speeds.
DDR3
DDR3 is the third generation of double data rate memory. Even more efficient than the DDR2, DDR3 operates on 1.5 volts of electricity. It is available in 800 Mhz, 1066 Mhz, 1330 Mhz and 1600 Mhz speeds. The DDR3 form factor, although consisting of the same number of pins, is not backwards compatible with DDR2 machines.
DDR4
DDR4 was set to be released in 2011 and the specs were not set in stone as of December 2010; although they were to be faster and more efficient than the DDR3's from all indications.
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