DDR2

popetes

Unbreakable
Joined
Nov 23, 2003
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2
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Milano
#1
2002
And one more story from JEDEC Committee. During the conference in Santa-Clara (California) the committee shared some preliminary DDR II specifications, which is the second generation DDR SDRAM standard expected to enter the mass market some time in 2004, as we read over here.
In the field of system memory, DDR-II specs are determined by the chips with the resulting frequencies of 400MHz, 533MHz, and 667MHz (600MHz frequency was removed from the list). In the graphics field they pre-defined the following frequencies: 800MHz and 1000MHz.all the chips will work at 1.8V and their capacity will be at least 512Mbit. The packaging should be 200-, 220- and 240-pin FBGA.

DDR II memory will use the same set of instructions but slightly modified and updated. The new DDR II features include: "posted CAS", differential strobe, OCD (off-chip output driver calibration), ODT (on-die termination), burst interrupt and a 4-bit "pre-fetch" instead of the 2-bit one as in DDR I.

The development of DDR II specs will be completed this month and in June they will release the definition of supported chips. In September the committee will offer the first specs for memory modules. All the largest memory makers promised to start the production of DDR II samples in the end of this year or beginning of the next year at the latest.
2004
Samsung Electronics today expanded its list of DDR-II offerings with a number of new SKUs. The move can potentially help the new DRAM standard to become popular in various market segments, including powerful personal computers as well as Intel Xeon-based servers.

In addition to 256Mb and 512Mb DDR-II chips operating at 400MHz, 533MHz and 667MHz, Samsung Electronics now wants to offer 1Gb DDR-II devices. The new DRAMs will be made using 0.10 micron process in the firm’s 300mm fab in Hwasung, South Korea.

Additionally, Samsung rolled-out its 2GB registered DDR-II DIMMs and 1GB unbuffered DDR-II modules, both based on the firm’s 512Mb chips that are in mass production now. Such modules may be used in servers, workstations or powerful personal computers - these markets do not represent a huge market in terms of volume, but are pretty stable and profitable. With the introduction of new platform chipsets from Intel, it is likely that 2GB registered DDR-II modules from Samsung will be in demand from server and/or workstation companies.

All new products are currently sampling. Typically it takes memory companies from 1.5 to 3 months to get these kings of devices into mass production.

Samsung also said it would expand its DRAM business by expanding its product portfolio, addressing various lucrative markets, such as graphics, digital consumer and mobile applications.
Am deschis subiectul pentru că marii producători de SDRAM au început deja să fabrice acest tip de memorie. Un studiu al SiliconStrategies.com arată că dimm-urile DDR-II vor apărea în masă pe piaţă cândva în acest an.
 
Joined
Oct 10, 2003
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Bucureşti
#4
Corsair a ajuns la 766 MHz cu timing-uri CL4 5-5-15, asta după ce a trecut prin 667 MHz cu CL4 4-4-12. Încet-încet treburile încep să se mişte, dar dezavantajul latenţelor mari se măreşte şi el.

Sursa
 

Alter Ego

PEDs, EPO & More.
Joined
Mar 24, 2004
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44°24'49"N, 26°05'48"E
#7
PQI Turbo 1GB PC4200 DDR2 Memory.

The performance advantage of DDR2 on our tests show that if you're getting a dual platform board like our DFI, there's really no particular reason to upgrade to DDR2 if you already have a good set of DDR. However, if you're building a system from scratch, DDR2 should be on your shopping list since it is undoubtedly the platform of the future for the PC, and if you're buying DDR2, you need look no further than PQI's PC4200. It's fast, stable, overclocks enough that you're not likely to be able to hit its limits anytime soon, and given the fact that it can be had for under $240 for a matched pair of 1GB modules, it's definitely one of the cheapest high performance DDR2 solutions around.
 

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Alter Ego

PEDs, EPO & More.
Joined
Mar 24, 2004
Likes
3
Location
44°24'49"N, 26°05'48"E
#8
Ca să calmeze piaţa DDR2, OCZ tocmai au făcut public marea ştire... au dus două module DDR1 în dual channel la performanţe de DDR2. Adică au ajuns la 772MHz cu timinguri 3-4-4, destul de urâte, dar şi DDR2 se confruntă cu problema asta, timinguri.

While 772MHz was attained, the best performance was at DDR1-660 with 8442 MB/s in SiSoft Sandra Memory bandwidth.
Aha...

Screenshot.
Deşi screenshot-ul este relevant nu-s foarte sigur că memoriile au fost prime stable, am eu un feeling. :smile:
 

L

factorul uman
Joined
Oct 11, 2003
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4
#10
Big wow... :mda:

Nu vad nimic special... oricum 2x 256 MB nu este o configuratie prea fericita in zilele noastre. Ce vreau eu este 300 MHz 2.5-3-3-7 1T (memtest stable) in configuratie 2x 512 MB cu max 2.8V in memorie. Atat si nimic mai mult... altceva nu ma mai incanta.
 
Joined
Oct 10, 2003
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Bucureşti
#13
În ultima perioadă, în lumea memoriilor DDR2 s-a produs ceea ce nu am mai întâlnit de la lansarea lui AMD Athlon încoace. La acea vreme, la fiecare câteva 1-2 luni, atât Intel cât şi AMD lansau câte un procesor, urcând cu câteva zeci de MHz frecvenţa versiunii anterioare. Nici vorbă de disponibilitate reală a acestor chip-uri, important era doar „să fii primul”.

Acum, Corsair, OCZ şi alţi producători de memorii lansează la câteva săptămâni câte un nou produs. Şi nu este vorba de cine ştie ce realizări, ci doar de selectarea unor memorii care rezistă unui overclocking dur. Tensiunea implicită a modulelor DDR2 este de 1.8V, însă ea a fost crescută la 1.9, apoi 2V, atingând acum 2.1V. Totul pentru cei 800 MHz la latenţe CL4 3-3-8 şi pentru a fi #1. De data aceasta, este vorba de OCZ, care deţine astfel cea mai rapidă memorie DDR2 din lume, devansându-şi modelul tactat la aceeaşi frecvenţă, dar cu latenţe CL5 5-5-8.
Sursa.

Vreau şi eu DDR2 la 1500 MHz CL9 9-9-17. Se poate?
 
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Neo

Motan agresif
Sugar daddy
Joined
Oct 16, 2005
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629
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The Emerald Dream
#19
E un trend care are totuşi adevăr la bază. Deja sunt faimoase incompatibilităţile între ICurile Promos şi DFI LanParty NF4 UltraD, la fel şi compatibilitatea perfectă între aceleaşi cipuri şi DFI Infinity NF4.
Certificarea asta mi se pare un lucru excelent, dacă nu adaugă la preţ mai mult de 1-5%.
 
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