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Topic: DDR RAM

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	SDRAM vs DDR RAM (Site not responding. Last check: 2007-10-22)
		DDR RAM can pass the data at approximately double the speed of SD RAM and the simple formula of performance is âmore fast data transfer, better will be the performanceâ.
		This double speed of DDR RAM is due to its property of transferring data on both the rising and falling edges of the clock signal.
		SD RAM and DDR RAM are not interchangeable.
	www.articleboom.com /Computer/article/ram.htm (895 words)

	DDR RAM SDRAM computer memory
		DDR ram uses latest technology to deliver a memory chip with performance to suit the newest CPUs with multi gigahertz clock speeds.
		DDR RAM, double data rate, can send data on both the rise and fall of the clock which has doubled its speed from SDRAM.
		DDR RAM SDRAM memory modules have 184 pins and memory chips either on a single side or both sides of the circuit board, depending on the memory capacity of the module.
	www.vtec.co.uk /ddr_ram_memory.asp (192 words)

	Ars Technica: RAM Guide: Part III: DDR DRAM and RAMBUS - Page 1 - (8/2000) (Site not responding. Last check: 2007-10-22)
		DDR DRAM is basically just a more advanced flavor of SDRAM, with an added twist at the data pins.
		So DDR can transfer two data words per clock cycle, as opposed to SDRAM's one word per clock cycle, effectively doubling the speed at which it can be read from or written to under optimal circumstances.
		Since DDR DRAM is an evolution of SDRAM, its overall approach to providing memory bandwidth is pretty much the same, aside from the fact that it transfers two words of data per clock.
	arstechnica.com /paedia/r/ram_guide/ram_guide.part3-1.html (1240 words)

	DDR RAM
		DDR RAM achieves its double data rate even though the internal RAM core operates at only the 133 MHz clock rate.
		Effectively, if a DDR RAM chip produces 8 data bits for every cycle of the 266 MHz clock, then it is internally producing 16 data bits for every cycle of the 133 MHz clock, but delivering on demand only 8 bits at a time to the I/O data pins.
		DDR RAM executes commands, which are usually issued by the chipset.
	www.ccs.neu.edu /course/com3200/parent/NOTES/DDR.html (2397 words)

	DDR MEMORY RAM, DDR PC2100, PC2700, PC3200, PC4200. DDR Memory review
		DDR memory, or Double Data Rate memory, is a new high performance type of memory that runs at twice the speed of normal SDRAM.
		With DDR memory now in the affordable price range, and motherboard manufacturers phasing out SDRAM on nearly every new board, it looks like DDR is definitely here to stay.
		DDR memory is the latest in high-performance memory module technological advances.
	www.ddrmemoryram.com (517 words)

	How to identify different sizes of computer memory RAM? DDR SDRAM MEMORY
		Different RAM manufacturers have developed their own methods of identification, so it is has become difficult to identify the chips without looking up the exact part number on a website that provides the information.
		DDR SDRAM uses a new technique to transfer data that effectively doubles its speed.
		This kind of RAM is being used on motherboards that run AMD Socket A Athlon and Duron processors, which are physically identical apart form the amount of onboard Level 2 cache they contain, and the bus speed that they run on - 100MHz for the Duron, and 133MHz for the Athlon.
	www.ddrsdrammemory.com /identifying_size_of_ram.html (1577 words)

	Mikhailtech - Micron 256mb DDR RAM Review (Site not responding. Last check: 2007-10-22)
		With the maturation of the DDR chipset, newer memory is becoming more and more efficient and the gains over PC133 are becoming apparent as ever.
		DDR transfers data in packages of 8 bits (1 byte), so PC1600 stands for 1.6gb/s transfer rate (100x8x2) and 2100 stands for 2.1gb/s transfer rate (133x8x2).
		It's not top notch, but as with most DDR it is nonetheless running at 7.5ns (lower right) which means it should overclock at least a bit.
	www.mikhailtech.com /articles/memory/mt256ddr (1114 words)

	Memory (RAM) and its influence on computer performance
		At first, technically speaking, the RAM memory does not have any kind of influence on the processor performance of the computer: the RAM memory does not have the power of making the computer processor work faster, that is, the RAM memory does not increase the processing performance of the processor.
		However, depending on the amount of RAM memory that your computer has, it is possible that those programs have too many instructions and, consequently, do not "fit" at the same time (or even alone, depending on the program) in the RAM memory.
		When we install more RAM memory in the computer, the probability of “running out” of RAM memory and having the necessity to make a change with the hard disk swap file is smaller and, therefore, you notice that the computer is faster than before.
	www.ddrmemoryram.com /memory_influence.html (896 words)

	T h e D D R Z o n e =>> DDR FAQ (Site not responding. Last check: 2007-10-22)
		DDR memory is clocked at the same speed as normal SDRAM (ie 100, 133mhz), The big difference between DDR and SDRAM memory is that DDR can transport double the amount of data it reads by utilizing both the rising and falling edges of the clock signal.
		DDR DIMMs currently support memory bus speeds of either 100 or 133MHz, with a faster memory bus speed of 166mhz reviewed by JEDEC and released by many of the leading memory manufacturers early in 2002.
		DDR specifies a CL of 2.5 or 2.
	www.theddrzone.com /faq.php (2575 words)

	DDR SDRAM - Wikipedia, the free encyclopedia
		DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers.
		DDR SDRAM DIMMs have 184 pins (as opposed to 168 pins on SDR SDRAM, or, 240 pins on DDR-2), and can be differentiated from SDRAM DIMMs by the number of notches (DDR SDRAM has one, SDR SDRAM has two).
		DDR is now replaced by DDR2 SDRAM, which has some modifications to allow higher clock frequency, but operates on the same principle as DDR.
	en.wikipedia.org /wiki/DDR_SDRAM (1036 words)

	Why Use DDR Memory Technology? - DDR Memory RAM at a glance
		DDR memory technology is an evolutionary improvement of mature PC100 and PC133 SDRAM technology.
		DDR memory chips are produced by semiconductor manufacturers using existing wafer fabs, processes and testers resulting in lower memory chip costs.
		DDR DIMM modules are referred to by their peak bandwidth, which is the maximum amount of data that can be delivered per second:
	www.ddrmemoryupgrades.com /why_use_ddr_technology.html (505 words)

	SDRAM DDR RAM and Rambus DRAM Info
		Double Data Rate (DDR) SDRAM is essentially the same thing as SDR SDRAM, except that it can output data on both the rising and falling edges of the clock signal.
		The standards for DDR SDRAM are known as PC1600 (200MHz data rate and 100 MHz clock) and PC2100 (266MHz data rate and 133MHz clock).
		DDR SDRAM will also be beneficial if you tend to have several applications open and busy at once, because the resulting chaos in memory access patterns will result in many more row changes.
	www.gen-x-pc.com /ram_memory_info_5.htm (3106 words)

	DDR Ram
		SD RAM is a burst mode memory that bursts a series of data words at the 66-MHz clock rate following the initial 58-ns random access latency.
		DDR RAM allows for data to be fetched on both the rising and falling edges of the clock, thus doubling the effective transfer rate of the clock.
		Double-data-rate (DDR) SDRAM could account for half of the memory market's unit shipments after 2002, a majority share that once was the sole claim of Direct Rambus DRAM, according to chip vendors and analysts.
	archive.chipcenter.com /circuitcellar/february01/c0201bs1.htm (832 words)

	RAM memory problems: Fix problems with DDR/DDR2 RAM
		The processor and the DDR RAM in this case are both actually using the 100MHz FSB speed being used by the motherboard.
		If it boots that far, all of the RAM is checked and registers at start-up, but it's very unstable and makes the system freeze most of the time during the boot process.
		If the configuration of the RAM you have installed is supported, you should know that some motherboards can be finicky about which slots can accept which types of RAM, and/or be finicky about mixing different types of DDR RAM.
	www.pcbuyerbeware.co.uk /RAMProblems.htm (6682 words)

	Review: OCZ Technology PC3200 Revision 2 DDR RAM
		Even assuming that your DDR motherboard can actually drive its RAM to 400MHz and beyond - and only motherboards using shiny new chipsets like Via's KT400 are actually likely to be able to without going flaky - there's a twofold problem with actually doing it.
		For 333 and 400MHz respectively your RAM performance scores will, of course, be an absolute maximum of 25% and 50% better, because that's the amount by which you've wound up the clock speed.
		If you want RAM that's as sure to be able to deal with a given kind of twiddling as is any RAM on the planet, then this stuff looks likely to fit the bill.
	www.dansdata.com /oczpc3200.htm (2090 words)

	About DDR Memory
		This is because DDR RAM transfer data on both the rising and falling edge of the clock whereas SDRAM only transfer data on the rising of the cycle.
		One of the first companies to implement the use of DDR RAM was nVIDIA with their line of high performace GeForce 3D video cards.
		DDR RAM is now available in the form of a DIMM, a memory module which can be easily inserted into a memory slot to add memory to your system.
	www.ddr-memory.com /about_ddr.asp (382 words)

	An illustrated Guide to RAM.
		Where DDR RAM is a development of the existing SDRAM technology, Intel choose RDRAM, which represents a much more revolutionary change in RAM design.
		All RAM slots have to be full; this is new, with RAMBUS we have to fill in blank modules in slots which are not in use.
		Intel claims that DDR is to slow for the new Pentium 4 processor.
	www.karbosguide.com /hardware/module2e4.htm (970 words)

	SysOpt Forums - DDR RAM
		RAM transaction speed is not the end-all for performance, any more than being able to red line an engine at 7500 necessarily makes a lawnmower go faster.
		But, as batmeat pointed out, the DDR can transfer data on both the rising and falling edges of the clock signal, while SDRAM can transfer on _either_ the rising _or_ the falling edge (I want to say it's the rising edge, but I'd have to look at datasheets to be sure).
		So the DDR memory subsystem itself runs faster, but the rest of the computer is still at whatever frequency it ran at before.
	www.sysopt.com /forum/showthread.php?t=57716 (412 words)

	DDR Ram - TechIMO Forums
		DDR is far better, not to mention SDRAM will be fading out soon.
		I think most stuidies have found that ddr ram doesnt even come close to being twice the data rate of sdram.
		Get the DDR, it is better than SDRAM in all cases, even if it is not twice as fast.
	www.techimo.com /forum/t8381.html (837 words)

	DDR SDRAM MEMORY - 266mhz PC2100 and 333mhz PC2700 DDR Memory
		DDR SDRAM memory has 184 pins, where as SDRAM has 168 pins.
		DDR SDRAM Memory is a new type of SDRAM that is able to double the read / write speed of the previous generation of SDRAM memory.
		DDR SDRAM memory is different from SDRAM memory and can only be used in systems designed specifically for DDR SDRAM memory
	www.ddrsdrammemory.com (376 words)

	DDR-Memory.com - DDR Memory and DDR RAM Information
		This DDR memory is able to run at speeds up to 333Mhz.
		DDR RAM has twice bandwidth of standard SDRAM.
		You can follow what is happening in the DDR memory scene on our DDR News Headlines.
	www.ddr-memory.com (426 words)

	Hard drives get even harder \| The Register
		It is slower than RAM though, and Flash memory also has a limited lifetime, as each cell can only be written to perhaps 10,000 times before failing.
		Flash's other problem is that it's good at reads but slow at writes, pointed out Woody Hutsell of Texas Memory Systems, which launched a new low-end DDR RAM-based solid state disk (SSD) at the show.
		Hutsell said this is partly because RAM runs hotter so needs more airflow, and partly because the boxes also contain batteries and hard disks, so if the power fails, the contents of the SSD can be automatically backed up.
	www.theregister.co.uk /2006/10/19/harder_hard_drives (715 words)

	NextGen Electronics - Ultra 512mb DDR RAM pc2100
		For that reason were very excited to have the ability to review this RAM, and very eager to put it, as well as the ULTRA company to the test.
		However, the ability to increase the performance of this RAM to the equivalent of the pc2700 RAM is what gives this product the increased longevity when compared to it's equals in the market today.
		With the upgraded pc2100 RAM you should easily be able to perform at 366 mhz or even 433 mhz, if your Motherboard can handle over clocking of that magnitude.
	www.nextgenelectronics.com /ultramem.shtml (948 words)

	what is SD RAM, DDR RAM and what is the difference between... - Q&A (Site not responding. Last check: 2007-10-22)
		DDR ram has a bunch of pins where they connect into the port on your motherboard, the pins look like this
		These are the physical differences, I belive DDR is faster but I am not sure, I know that SD ram is found in older computers more often so I am guessing DDR is better.
		2.DDR RAM (double data rate ram comes as pc2100,pc2700,pc3200 difference with ddr is the numerical area doesnt equal to the amount of mhz but i wont go on about that plain and simple ddr is faster then sd but you must choose the right mainboard to suit check at you mainboard site to see compatibilty.
	www.faqs.org /qa/qa-15297.html (450 words)

	Which DDR RAM to buy? different types of DDR RAM, PC2100 PC2700 200MHz
		But with DDR RAM installed, the processor's effective data transfer speed would be responsible for creating the bottleneck.
		If you purchase PC2700 RAM, the Duron 1.3GHz processor runs on a base FSB of 100MHz, doubled to give an effective data transfer speed of 200MHz, while the RAM runs on a base FSB of 166MHz, which is effectively 333MHz using the DDR technology.
		The ECS motherboard supports PC2700 DDR RAM, so if that is installed with the new processor, the effective data transfer rate would be increased from 200MHz to 266MHz, and the bottleneck between the RAM and processor would be reduced from 133Mhz to 66MHz.
	www.rdramrambusmemory.com /what_is_ddr_ram.html (942 words)

	512MB DDR RAM PC2100 184-Pin DIMM Major/3rd
		DDR modules are well suited for a broad range of applications, especially the workstation and server markets where the high module density and speed can meet the performance demands of these products!
		The performance improvement in Double Data Rate (DDR) memory is a key technology that helps to ensure memory stays in step with the constantly increasing performance of microprocessors.
		DDR provides a cost-effective, high-performance main memory solution that does not require a considerable development or manufacturing investment, while maintaining a cost structure consistent with conventional synchronous DRAMs!
	www.geeks.com /details.asp?InvtID=512DDR2100-UPC-N (258 words)

	An illustrated Guide to DDR RAM.
		A very interesting RAM type is the DDR RAM, which is expected to hit the market in 2001.
		VIA expects DDR to be used in all segments of the pc market.
		This goes for all future desktop PCs until 2003, according to their agreement with Rambus Inc. Only the 64 bit server Itanium processor and it succesors Foster and McKinley are using DDR RAM.
	www.karbosguide.com /hardware/module2e5.htm (550 words)

	ddr ram into sd system
		DDR RAM is not backwards compatible with SDRAM.
		sd ram has a different pin out, the slot is in a different place so it won't work.
		CL2 is the CAS latency of the RAM, part of the RAM's timings.
	www.daniweb.com /techtalkforums/thread6264.html (710 words)

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