cheap GEIL 8GB DDR2 800 CL5.0 QUAD CHANNEL BLACK DRAGON RET

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PC Components»Memory»DDR2 Modules

GEIL 8GB DDR2 800 CL5.0 QUAD CHANNEL BLACK DRAGON RET

	GB28GB6400C5QC

Product No: 9962

£ 80.88
inc VAT price: £ 93.01
In stock: 15

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.

Products from the same brand


GEIL 2GB DDR2 800 CL4.0 METALLIC ORANGE ALUMINUM RET Product No: 100671	GeIL	1	£21.6 inc. vat 24.84


GEIL 4GB DDR2 800 CL4.0 DUAL CHANNEL METALLIC ORANGE ALUMINUM RET Product No: 154225	GeIL	4	£43.29 inc. vat 49.78


GEIL 8GB DDR2 800 CL5.0 QUAD CHANNEL EVOONE RET Product No: 129278	GeIL	12	£103.75 inc. vat 119.31


GEIL 4GB DDR2 800 CL5.0 DUAL CHANNEL EVOONE RET Product No: 185375	GeIL	3	£50.38 inc. vat 57.94


GEIL 1GB DDR2 800 CL5.0 16 CHIP BRUSH ALUMINUM RET Product No: 192208	GeIL	89	£13.09 inc. vat 15.05


GEIL 1GB DDR2 667 CL5.0 16 CHIP BRUSH ALUMINUM RET Product No: 298000	GeIL	40	£12.63 inc. vat 14.52

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