What's the difference between DDR, DDR2 and SDRam?
Answer:
The Difference is tat SDRAm is a Slow Memory Processor...Wheareas...DDR is the Fast 1 than Sdram and DDR2 is the Fastest RAM.....Well Check ur Machine's MotherBoard Version---Check the Net If it Supports DDR or DDR2 or SDram...hav a Nice day
different motherboards support different rams. Cant put a DDR which does not have the slots suitable for the DDR.
DDR (Double Data Rate) refers to an SDRAM memory chip that increases performance by doubling the effective data rate of the frontside bus.
SDRAM (Synchronous DRAM) is a type of DRAM memory chip that has been widely used since the latter part of the 1990s. SDRAM chips eliminate wait states because they are fast enough to be synchronized with the CPU's clock. The chip is divided into two cell blocks, and data are interleaved between the two. While a bit in one block is accessed, a bit in the other is prepared for access. This allows SDRAM to burst subsequent, contiguous characters at a much faster rate than the first character.
DDR and DDR2
Double Data Rate SDRAM (DDR) doubles transfer rates by transferring data on both the rising and falling edges of the clock. DDR uses additional power and ground lines and is packaged on a 184-pin DIMM module rather than the 168-pin DIMM used by the first SDRAM chips. Laptops use 200-pin SODIMM modules.
DDR2 chips increase data rates using various techniques such as on-die termination, which places the terminating transistors that eliminate excess signal noise on the chip itself. DDR2 modules require 240-pin DIMM slots, and although they are the same length as DDR, they are keyed differently and will not fit into the DDR slot.
Dual Channel DDR and DDR2
Chipsets on the motherboard may support two independent memory controllers, which allow access to two memory modules simultaneously (upstream data on one 64-bit channel; downstream data on the other). Channels can be configured as two 64-bit or one 128-bit. Modules must be installed in matched pairs unless the chipset has an option for mismatched modules.
DDR2 is a new memory standard defined by JEDEC (Joint Electronic Device Engineering Council), whose members include many of the major computer memory and chipset manufacturers. JESD 79-2A to be exact.
In terms of speed, DDR2 will start up where DDR memory left off, at 400Mhz DDR, also described as PC3200. DDR2 will also be available at 533MHz DDR, 667MHz DDR and 800MHz DDR specifications.
DDR2-SDRAM is considered an evolutionary upgrade over existing DDR memory. It maintains the same core functions, transferring 64 bits of data twice every clock cycle for an effective transfer rate twice that of the front-side bus (FSB) of a computer system, and an effective bandwidth equal to its speed x 8.
DDR2 introduces new features which allow it to ramp up to much higher speeds (with correspondingly higher bandwidth) and higher memory densities, all the while using less power.
DDR2 memory uses a new form factor, a 240 pin DIMM (Dual Inline Memory Module) which is *not* compatible with current DDR memory slots. Upcoming chipsets by Intel and other manufacturers will support DDR2 specifically, and are not backwards compatible.
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