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 Post subject: Dual Channel is a better solution than using DDR2
PostPosted: Fri Nov 18, 2005 3:38 am 

Joined: Tue Jun 20, 2000 6:29 am
Posts: 14
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It's obvious that Dual channel increase throughput almost double.

Not DDR2 533MHz, how about DDR2 667MHz or above?

By Roger Chu, Marketing Intelligence Team, DRAMeXchange

Not only the DDR2 supported Intel chipset shortage delays DDR2 to be dubbed as the mainstream memory, the lack of performance leap over the mainstream DDR 400MHz also discourages consumers' buying incentives. Buying incentives at the clone market are not arouse much as well amid the listed factors. When everyone is holding conservative views over DDR2 533MHz, we believe DDR2 667MHz should be capable to bring the memory generation to a new level. The emerge of DDR3, should also come along with the growing acceptance of DDR2 accordingly.

Performance leap for DDR2 667MHz

Memory cell requires a constant electricity flow to maintain the integrity of the stored data. When memory makers enable DDR to maintain the data integrity without the concern of electricity flow, a 100MHz DDR chip could attain a data transference speed of 200Mbps. Under the "4 bit Prefetch" architecture, DDR2 attains a double data transference speed over DDR (4bit vs. 2bit) as it delivers 2 bit every 10ns to the I/O buffer and in turn sends it across the bus at a frequency of 200MHz.

Under the same core frequency, the data latency time for both DDR and DDR2, however, are identical - i.e. the slower the core frequency speed, the longer the latency time is. Core frequency for DDR2 400MHz is 100MHz, which represents that its data latency time is comparatively higher than the 200MHz core frequency DDR 400MHz. With most motherboards supporting the dual channel architecture, the final test value for DDR2 533MHz does not result in any performance blip over DDR 400. Noticeable progress is only evident at the DDR2 667MHz or above generation (see Figure 1).

DDR2 800MHz should start volume production in 1H06

Boosting the memory speed is not a tough job for memory makers if they are capable to make progress on the chip design and the process node shrink. The chief challenge laid only on confronting the memory voltage to the JEDEC-regulated 1.8V+/-0.1V standard. Under the 0.11-micron process, only 30% of the chips could be sorted as DDR2 667MHz. When the process node advances to 90nm, the ratio will climb to as high as 90%.

Most DRAM makers have gain Intel's validation on DDR2 667MHz with limited shipment already started. However, DDR2 667MHz still comes with a 10% price premium over DDR2 533MHz. In order to ease the present DDR2 inventory, selective memory makers are being pushed to label DDR2 667MHz as DDR2 533MHz for sales. Although suffering from the high DDR2 inventory, memory makers should proceed volume production for DDR2 800MHz from 1H06. (see Figure 2).

DDR3 not to rise as mainstream before 2008

When memory speed migrates to 800MHz, another new era of memory generation begins - DDR3. The difference between DDR2 and DDR3 is minimal but the 4 bit Prefectch will ramp up to 8 bit instead, thus boosting the frequency from 800MHz to 1600MHz accordingly. Samsung and Infineon have already announced respectively launch of DDR3 chips but these chips are only applied on the highend graphics at the moment.

The concept of DDR3 had long been established ever since 2002 amid JEDEC's related standards information released. However, the delay of DDR2 has also shadow on the time schedule of DDR3, thus led to the chip giant Intel prosponding the debut time to 2007. With reference to the previous generations memory roadmap, DDR3 should only rise as mainstream in 2008 at the earliest and the transition should also take place at those power consumption oriented applications such as server and notebook at the first place.

Despite consumption incentives among some enthusiastic players should be stimulated when the system performance enjoy leap from the DDR2 667MHz generation, penetration rate should still count on the availabilit


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 Post subject: Re: Dual Channel is a better solution than using DDR2
PostPosted: Fri Oct 26, 2018 11:02 pm 

Joined: Fri Oct 26, 2018 10:15 pm
Posts: 13
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