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Double Data Rate 2 Synchronous Dynamic Random-Access Memory (DDR2 SDRAM) is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) interface. It is a JEDEC standard (JESD79-2); first published in September 2003. [2] DDR2 succeeded the original DDR SDRAM specification, and was itself succeeded by DDR3 SDRAM in 2007.
Dual-channel memory slots, color-coded orange and yellow for this particular motherboard. Dual-channel-enabled memory controllers in a PC system architecture use two 64-bit data channels. Dual-channel should not be confused with double data rate (DDR), in which data exchange happens twice per DRAM clock. The two technologies are independent of ...
Thus, the memory configuration in the example can be simplified as: two DDR2-800 modules running in dual-channel mode. Two memory interfaces per module is a common configuration for PC system memory, but single-channel configurations are common in older, low-end, or low-power devices.
FPM, EDO, SDR, and RDRAM memory was not commonly installed in a dual-channel configuration. DDR and DDR2 memory is usually installed in single- or dual-channel configuration. DDR3 memory is installed in single-, dual-, tri-, and quad-channel configurations. Bit rates of multi-channel configurations are the product of the module bit-rate (given ...
Memory type supported High-speed interfaces provided Preferred IOCH 3000: Mukilteo-2 [23] [24] 533 or 800 or 1066 MT/s Two channels of ECC DDR2-533 or DDR2-667 PCI Express ×8 port, single 32-bit 33 MHz PCI bus, DMI for ICH7 ICH7 3010: Mukilteo-2P PCI Express 1 ×16 or 2 ×8 ports, single 32-bit 33 MHz PCI bus, DMI for ICH7 3200: Bigby-V
Dual Channel DDR SDRAM Dual Channel DDR2 SDRAM DDR 200/266/333/400 MHz DDR2 400/533 MHz 4.0 GB 1066 MB/s 8x x4 No PT880 Ultra [38] VT VT8237, VT8237R(+), VT8237A, VT8237S Jan 2005 LGA 775 Pentium 4, Pentium D, Celeron, Celeron D, Core 2 533/800/1066 MHz Dual Channel DDR SDRAM Dual Channel DDR2 SDRAM DDR 266/333/400 MHz DDR2 400/533/667 MHz
DDR memory bus width per channel is 64 bits (72 for ECC memory). Total module bit width is a product of bits per chip and number of chips. It also equals number of ranks (rows) multiplied by DDR memory bus width. Consequently, a module with a greater number of chips or using ×8 chips instead of ×4 will have more ranks.
A memory controller, also known as memory chip controller (MCC) or a memory controller unit (MCU), is a digital circuit that manages the flow of data going to and from a computer's main memory. [ 1 ] [ 2 ] When a memory controller is integrated into another chip, such as an integral part of a microprocessor , it is usually called an integrated ...