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DDR -> DDRII -> DDRIII - Page 3

post #41 of 77
Thread Starter 
http://www.trustedreview.com/article.aspx?art=1203
Quote:
DDR2: The Memory That Gives and Gives
Japanese DRAM supplier Elpida has managed to crank up DDR2 RAM to 800MHz and is already sampling chips to customers.
The caveat is that the new memory is only in 256Mb capacities so far with 8bit versions doing the rounds and 16bit widths to be ready next month. They are fabbed at the 110 nanometre (nm) process and use 1.85V while operating with a CAS Latency (CL) of 5. Volume production is expected to commence in May. Early adopters, naturally enough, include Taiwanese module manufacturers A-DATA Technology and Transcend Information.

Obviously, the news means motherboard manufacturers are going to need to get their collective fingers out given the short timescale and the fact that no motherboards today support DDR2 clocked above 667MHz. Needless to say, Elpida will be pitching its memory at high end PCs and it ties in neatly with the latest 800MHz front side bus processors.

Jun Kitano, Elpida’s Director of Technical Market, was keen to make this point: “800Mbps is a major milestone for DDR2 SDRAM. It is an ideal match for the latest processor front side bus, allowing PCs to maximise data throughput at a rate that is faster than ever before.”

Interestingly, while 256Mb parts are the current golden boy, the company did reveal that it managed to sample a 1Gb 800MHz part back in November. Given that the new memory is likely to cost a pretty penny at a quarter of this capacity when they begin shipping later in the year, we can only guess how much it cost Elpida to make the 1Gb version back then?!

If you remember, it was just last month Samsung announced DDR3 to the world but obviously this is some way off. Still, looks like the memory industry continues to go from strength to strength.


post #42 of 77
Thread Starter 
Something to ponder about. It seems the DDR2-PC3200(400Mhz) has a much better latency than the DDR2-PC4200(533Mhz). It also operates as a bit lower power than the PC4200 version as well.

That might be the reason why some companies are using it rather than the PC4200. Such as Gateway M460XL, Toshiba Tecra M3, and Asus V6V model.

Example:

1) Kingston KVR400D2S3/512
http://www.valueram.com/datasheets/KVR400D2S3_512.pdf
Quote:
Standard 64M X 64 Non-ECC 400MHz 200-pin Unbuffered SODIMM (SDRAM-DDR2, 1.8V, CL3)
-VS-

2) Kingston KVR533D2S4/512
http://www.valueram.com/datasheets/KVR533D2S4_512.pdf
Quote:
Standard 64M X 64 Non-ECC 533MHz 200-pin Unbuffered SODIMM (SDRAM-DDR2, 1.8V, CL4)
post #43 of 77
http://www.gamepc.com/labs/view_cont...ookie%5Ftest=1

Not quite a good comparision, but you can see DDR2-533 @ CL5 and then DDR2-400 @ CL3. It seems like latency is better in the 533 stuff than the 400 stuff even at the same CL level? So in the end I doubt there is much difference between 533 cl4 and 400cl3. I bet the only real reason it is shipping in some is that it probably costs them less so they can get higher margins. (that one test was on a P4 system though, no sure how the bus on a Pentium-M plays into all of this...too bad no great comparative benchmarks in this case)
post #44 of 77
Thread Starter 
DDR2: a Soon-to-be DDR Replacement. Theoretical Basis and First Low-level Test Results
http://www.digit-life.com/articles2/...ddr2-rmma.html







post #45 of 77
Thread Starter 
Understanding Latency and how it affects DOOM3!!

http://www.corsairmicro.com/corsair/...erformance.pdf
post #46 of 77
Ok, I'm baffled with all this technical data. Let me pose a simple question:

How do these computers compare with each other?
Pentium M 2.0 GHz with 533 MHz FSB and 1 GB 533 MHz DDR2 (1 DIMM)
Pentium M 2.0 GHz with 533 MHz FSB and 1 GB 400 MHz DDR2 (1 DIMM)
Pentium M 2.0 GHz with 400 MHz FSB and 1 GB 333 MHz DDR1 (1 DIMM)
post #47 of 77

Inspiron 9200 DDR 2700 => DDR 3200/ DDR2 ?

Hey guys . I got my Inspiron 9200 about a month ago , and it comes with 512 Mb of DDR2700 RAM . Is it possible for me to upgrade it to 333 MhZ? or possibly , DDR2 ? will it make any difference ?
post #48 of 77
Quote:
Originally Posted by Tommi
Ok, I'm baffled with all this technical data. Let me pose a simple question:

How do these computers compare with each other?
Pentium M 2.0 GHz with 533 MHz FSB and 1 GB 533 MHz DDR2 (1 DIMM)
Pentium M 2.0 GHz with 533 MHz FSB and 1 GB 400 MHz DDR2 (1 DIMM)
Pentium M 2.0 GHz with 400 MHz FSB and 1 GB 333 MHz DDR1 (1 DIMM)

the first one is on par with with most p4 machines

the second is still pretty darn good

the third is weak with horrible mem and a lower fsb
post #49 of 77
Quote:
Originally Posted by digitanium
Hey guys . I got my Inspiron 9200 about a month ago , and it comes with 512 Mb of DDR2700 RAM . Is it possible for me to upgrade it to 333 MhZ? or possibly , DDR2 ? will it make any difference ?
it is impossible to upgrady to ddr2 as ddr slots and ddr2 slote are incompatible but upgrading the ddr speed(mhz) depends on your motherboard if you gave me the mobo numbers i could look it up and tell you if you can
post #50 of 77
Thread Starter 
Quote:
Originally Posted by Tommi
Ok, I'm baffled with all this technical data. Let me pose a simple question:

How do these computers compare with each other?
Pentium M 2.0 GHz with 533 MHz FSB and 1 GB 533 MHz DDR2 (1 DIMM)
Pentium M 2.0 GHz with 533 MHz FSB and 1 GB 400 MHz DDR2 (1 DIMM)
Pentium M 2.0 GHz with 400 MHz FSB and 1 GB 333 MHz DDR1 (1 DIMM)
With the 3 you've provided above, if my understanding of it correctly, there are little differences between the first two.

http://www.tomshardware.com/mobile/2...alviso-03.html

The 533Mhz Bus will be able to do approx 4.2GB/sec. With that, a single channel 533Mhz DDR2 memory will be able to gear up to par with that bandwidth. A dual channel DDR2-533 memory is overkill as the bus would not be able to fully take advantage of that bandwidth.

In the last a "DUAL" channel DDR-400 on a 533Mhz Bus will have very mininmal differences in bandwidth vs a "SINGLE" channel DDR2-533 as they will have similar bandwidth.

But given from your heirarchy above, yes the top wlil be the fastest and the bottom will be the slowest.
post #51 of 77
Thanks. The Tom's HWG's link was perfect. It shows that the 770 platform is 4-9% faster than 765 with DDR333 in the tests.
post #52 of 77

inspron 9200 DDR memory

Quote:
Originally Posted by Pclover8891
it is impossible to upgrady to ddr2 as ddr slots and ddr2 slote are incompatible but upgrading the ddr speed(mhz) depends on your motherboard if you gave me the mobo numbers i could look it up and tell you if you can

how do i find my motherboard number ?
post #53 of 77
Thread Starter 
post #54 of 77
Thread Starter 
http://www.digitimes.com/systems/a20050329A1001.html
Quote:
Taiwan DRAM makers: Migration to DDR2 hitting snags
Hans Wu, Taipei; Rodney Chan, DigiTimes.com [Tuesday 29 March 2005]
Although Taiwan DRAM makers have been ramping up DDR2 production, they are seeing their inventory build up, as demand has not picked up as expected, according to market sources.

The DRAM makers had expected DDR2 to become the mainstream memory product in the second half of this year.

Taiwan makers currently only produce DDR2 400, and with the product having no obvious improvements over comparable DDR products, international PC OEMs have begun reducing their orders for DDR2 400, the sources said.

According to sources, DRAM makers are also seeing delays in receiving DDR2 certification from notebook OEMs.

Demand for DDR2 has failed to pick up for another reason: memory makers have been rushing to sell off their DDR at low prices in anticipation of a shrinking DDR market, and therefore curbing the growth of DDR2, the sources said.
post #55 of 77
DDR-II @ 400 MHz is something I would say to avoid, DDR-II @ 533 is definetly much better (especially with the sonoma since it runs syncronous with the FSB)
post #56 of 77
DDR2-400 & DDR2-533 dosen't provide ANY noticeable benefits compared to DDR333 & DDR400. DDR2-667 & DDR2-800 however are better, but too bad that the "Sonoma" platform dosn't support these speeds. Not to brag, but I get both higher memory bandwidth and lower memory latency on my notebook compared to the fastest "Sonoma" notebooks with dual-channel DDR2-533
post #57 of 77
Here's a nice article on the subject:

DDR memory offers lots of hard choices

post #58 of 77
Would using DDR2 400MHz Ram be considerably slower in memory throughput than DDR2 533MHz, all used with a Sonoma Pentium-M with an FSB 533Mhz?

In the first case, the RAM is slower than the FSB, would that basically make the Sonoma look like a Dothan (400MHz FSB)? And thus no point in buying a Sonoma Pentium-M?
post #59 of 77
Quote:
Originally Posted by smilepak
...http://www.tomshardware.com/mobile/2...alviso-03.html

The 533Mhz Bus will be able to do approx 4.2GB/sec. With that, a single channel 533Mhz DDR2 memory will be able to gear up to par with that bandwidth. A dual channel DDR2-533 memory is overkill as the bus would not be able to fully take advantage of that bandwidth.

In the last a "DUAL" channel DDR-400 on a 533Mhz Bus will have very mininmal differences in bandwidth vs a "SINGLE" channel DDR2-533 as they will have similar bandwidth....


So any idea when there will be a Pentium M bus capable of doing dual-channel justice???
post #60 of 77
Thread Starter 
Quote:
Originally Posted by uschou@yahoo.co
So any idea when there will be a Pentium M bus capable of doing dual-channel justice???
In order to do dual channel justice in terms of data transfer rate, you would need, i believe someone post it, approx 800mhz or higher bus.
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