cheap ADATA 512M DDR2 800 CL5.0 08 CHIP

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PC Components»Memory»DDR2 Modules

ADATA 512M DDR2 800 CL5.0 08 CHIP

	M2GVD6G3H3160G1E53

Product No: 10418

£ 7.62
inc VAT price: £ 8.95
In stock: 2

Like all SDRAM implementations, DDR2 stores memory in memory cells that are activated with the use of a clock signal to synchronize their operation with an external data bus. Like DDR before it, DDR2 cells transfer data both on the rising and falling edge of the clock (a technique called "dual pumping"). The key difference between DDR and DDR2 is that in DDR2 the bus is clocked at twice the speed of the memory cells, so four words of data can be transferred per memory cell cycle. Thus, without speeding up the memory cells themselves, DDR2 can effectively operate at twice the bus speed of DDR.

DDR2's bus frequency is boosted by electrical interface improvements, on-die termination, prefetch buffers and off-chip drivers. However, latency is greatly increased as a trade-off. The DDR2 prefetch buffer is 4 bits deep, whereas it is 2 bits deep for DDR and 8 bits deep for DDR3. While DDR SDRAM has typical read latencies of between 2 and 3 bus cycles, DDR2 may have read latencies between 4 and 6 cycles. Thus, DDR2 memory must be operated at twice the bus speed to achieve the same latency.

Another cost of the increased speed is the requirement that the chips are packaged in a more expensive and more difficult to assemble BGA package as compared to the TSSOP package of the previous memory generations such as DDR and SDRAM. This packaging change was necessary to maintain signal integrity at higher speeds.

Power savings are achieved primarily due to an improved manufacturing process through die shrinkage, resulting in a drop in operating voltage (1.8 V compared to DDR's 2.5 V). The lower memory clock frequency may also enable power reductions in applications that do not require the highest available speed.

Alternative products at ±10% price


GEIL 512MB DDR2 667 CL5.0 08 CHIP BRUSH ALUMINUM RET Product No: 129638	GeIL	10	£7.79025 inc. vat 9.15

Products from the same brand


VDATA 2GB DDR2 800 CL5.0 16 CHIP Product No: 721531	Adata	474	£19.07025 inc. vat 22.41


ADATA 2GB DDR2 800 CL5.0 DUAL CHANNEL KIT RET Product No: 227130	Adata	20	£26.47275 inc. vat 31.11


ADATA 2GB DDR2 800 CL5.0 16 CHIP Product No: 127135	Adata	2	£18.8 inc. vat 22.09


VDATA 1GB DDR2 800 CL5.0 16 CHIP Product No: 168495	Adata	3	£12.65156 inc. vat 14.87


ADATA 4GB DDR2 800 CL5.0 DUAL CHANNEL KIT RET Product No: 222446	Adata	17	£46.577 inc. vat 54.73


ADATA 1GB DDR2 667 CL5.0 16 CHIP Product No: 9530	Adata	12	£10.37525 inc. vat 12.19

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