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Topic: RDRAM

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	The RDRAM Avenger - Intel's i840 Chipset \| Tom's Hardware
		Now we know that RDRAM is a serious political issue in itself already, because RAMBUS, its developer, receives royalties for each sold RDRAM-module.
		RDRAM has got a very different interface to the memory-types we are used to so far.
		RDRAM is still super-expensive, costing about $1000 for 128 MB.
	www.tomshardware.com /1999/12/15/the_rdram_avenger_ (1451 words)

	RDRAM - Wikipedia, the free encyclopedia
		RDRAM includes a memory controller on each memory chip, significantly increasing manufacturing complexity compared to SDRAM, which used a single memory controller located on the northbridge chipset.
		RDRAM allowed N64 to be equipped with a large amount of memory bandwidth while maintaining a lower cost due to design simplicity.
		RDRAM was initially going to be considered the main memory choice for all Intel processors[2].
	en.wikipedia.org /wiki/RDRAM (1068 words)

	RDRAM vs SDRAM
		RDRAM, on the other hand, is mounted on a different slot called RIMM (Rambus Inline Memory Module).
		On the other hand, RDRAM has a serial nature in that individual chips are connected in serial to the data bus.
		Due to the serial nature of RDRAM, the chips closest to the memory controller take much less time to respond to the controller, compared to those that are located further away.
	www.pcquest.com /content/technology/10004404.asp (1096 words)

	RDRAM versus SDRAM, Distinguishing Fact From Fiction
		During the development of RDRAM, the manufacturers promised a bandwidth of twice that of PC100, which is true to a certain extent, but this is only valid when comparing PC800 RDRAM with PC100 SDRAM.
		Double-pumped means that data is transferred to the RDRAM on both the rising and falling edges of the clock, which is often referred to as double data rate *(DDR), creating an effective 800 MHz memory rating.
		RDRAM is a memory architecture that relies on a packet-based protocol with an access latency that largely depends its distance from the memory controller.
	www.dewassoc.com /performance/memory/rdram_v_sdram.htm (2066 words)

	Rambus - RDRAM®
		The RDRAM memory interface achieves its high-speed design with innovative architectural and circuit features such as a highly efficient packet-based protocol, pipelined command and data, low-voltage signaling and precise clocking to minimize skew between clock and data lines.
		Additionally, standard RDRAM memory controllers are available in a wide range of ASIC and foundry processes in a variety of different advanced geometries from 0.25 to 0.13 m.
		RDRAM memory solutions give designers a significant advantage by delivering total solutions that are truly scalable over a broad range of application performance needs, while leveraging the existing RDRAM infrastructure.
	www.rambus.com /us/products/rdram/index.html (296 words)

	An illustrated Guide to RAM.
		RDRAM is an advanced technology patented by a company, who sells the technology to other chip manufactures for a 2% in license.
		RDRAM is developed from the traditional DRAM, but the architecture is completely new.
		The RDRAM chips have to be placed very close to the CPU to reduce radio noise.
	www.karbosguide.com /hardware/module2e4.htm (970 words)

	SAMSUNG's Digital World - Semiconductor \| XDR™/RDRAM
		RDRAM devices provide systems with 16MB to 2GB of memory capacity at speeds of up to 1066MHz.
		The RDRAM channel achieves its a high-speed through several innovative techniques that include separate control and address buses, highly efficient protocol, low voltage signaling and precise clocking to minimize skew between clock and data lines.
		RDRAM memory provides the bandwidth necessary to extract the full potential of the Intel Pentium™ 4 processor.
	www.samsung.com /Products/Semiconductor/XDR_RDRAM/rdram.htm (430 words)

	RDRAM
		RDRAM production, on the other hand, does not integrate well with regular SDRAM production, and that's a big negative when economies of scale are as important as it is in the memory industry.
		RDRAM makes manufacturers change their production habits, which they don't want to do for a variety of reasons.
		RDRAM will probably always cost more than DDR, but (provided that yields of PC800 can be brought to reasonable levels) it should not cost inherently a great deal more than DDR once mass-produced.
	www.dewassoc.com /performance/memory/ddr_rdram.htm (12599 words)

	RDRAM/DDR: Part I, Technical Aspects
		The reason is SDRAM design has to spread the workload out among the chips fairly evenly, and RDRAM chips do not, so you can often have the case of one part of a RDRAM module doing all the work, grabbing most of the power, and thus generating a lot of heat.
		Due to their high speed, RDRAM connections are harder to place and make than SDRAM channels, but there are a lot fewer of them, so on the whole, motherboard design is simpler, even if you have two RDRAM channels.
		In the next segment, we'll look at why RDRAM costs so much, how much of that is due to it being inherently more expensive to make than SDRAM, and how much of it is due to the politics of the situation.
	www.overclockers.com /articles146 (4097 words)

	Where to get PC1066 RDRAM? - Overclockers Forums
		RDRAM has a frequency timing module or something on the motherboards that generates the 400 MHz signal and coordinates the memory timings.
		If this were not the case you would have to buy different RDRAM depending on if you had a single (i840) or dual channel (i850) board, when in fact all you have to do is get two identical modules to run a dual-channel board.
		Since the RDRAM modules are identical between dual and single channel, with dual channel you have two RDRAM modules running at 4b/s x 400MHz=1600Mb/s x 2 channels=3200Mb/s bandwidth.
	www.ocforums.com /showthread.php?t=59525 (999 words)

	RDRAM information and part numbers for Dell systems
		Find the RDRAM for your specific system model using the part numbers listed here at the lowest prices.
		Once you find a good price for your RDRAM I strongly urge you to check the ratings of the seller Before you order your memory.
		In general higher speed rdram can be used in systems running at slower speeds if the memory is a match for the system otherwise.
	home.pacbell.net /dbk4297/dell_rdram.html (403 words)

	DDR or RDRAM? - TechSpot Troubleshooting
		Then well RAMBUS will still be pushing RDRAM for a while so I would expect it to continue.
		But I do feel both RDRAM and DDR are here to stay for a while.
		So choosing DDR would last longer than RDRAM in my case and I wouldn't have much regret in using "low bandwidth" memory in my next system.
	www.techspot.com /vb/all/windows/t-3635-DDR-or-RDRAM.html (979 words)

	Intel backs away from RDRAM \| Tech News on ZDNet
		RDRAM availability has increased and prices have fallen significantly since the subsidies were started in conjunction with the launch of the Pentium 4 last November.
		It lowered the rebate to $60 in the first quarter of 2001 and later extended the program through the end of the second quarter, when it was to be phased out.
		The idea of this program, which included a Pentium 4 processor with two RDRAM chips, was to bundle the chip and memory for a price that was lower than purchasing them separately, thus subsidizing the cost of the memory and helping PC makers ensure adequate supplies of the memory chips.
	news.zdnet.com /2100-9595_22-530361.html (705 words)

	RDRAM Won't Die - nV News Forums
		At present, the RDRAM platform is limited mostly to the high-end market, and with Intel showing stronger support for the DDR platform, the market share of RDRAM-based chipsets has dropped from 15% in 2001 to the current 10%.
		While RDRAM may not be "all that" in the future, they sure have been one of the better investments I ever made (PC wise that is), and are a great match for my 2.26@3034 Mhz.
		My objection to RDRAM is the fact that you have to buy 2 modules of it in order to get maximum performance, thereby increasing your costs even more than if you were able to buy one standalone stick of good 'ol DDR.
	www.nvnews.net /vbulletin/showthread.php?t=300 (815 words)

	Weekly Platform Trends: Samsung Raises the Bar for RDRAM (Site not responding. Last check: )
		Samsung was able to push the RDRAM envelope by moving to an 0.12-micron process for its memory chips.
		While current RDRAM technology can actually support these higher speeds (at least in engineering samples), it does so with some trade: It's tougher to produce the chip quality needed for such high bus speeds, and the stability of such RDRAM (which can run hot to begin with) is a potential concern.
		RDRAM is larger and bulkier than its SDRAM/DDR competitors, and the inclusion of a heatsink on the side of the module doesn't exactly streamline the design.
	hardware.earthweb.com /chips/article.php/894231 (1190 words)

	AnandTech (Site not responding. Last check: )
		RDRAM is a memory type that offers high bandwidth, based on a RAMBUS memory interface controller.
		Although the current implementation of RDRAM has a bus that is only 16-bits wide, it operates at 400MHz DDR, or effectively 800MHz.
		In a Pentium 4 dual 16-bit channel RDRAM system with 4 RIMM slots, the two RDRAM banks are separate and then multiplexed to provide the huge bandwidth that the Pentium 4 requires.
	www.anandtech.com /guides/viewfaq.html?i=102 (577 words)

	Ars Technica: RAM Guide: Part III: DDR DRAM and RAMBUS - Page 5 - (8/2000) (Site not responding. Last check: )
		RDRAMs are attached to memory modules, called RIMMs, just like SDRAMs are attached to DIMMs, but again, each RDRAM is attached to this channel in series, so that all of the signals that are placed on the RAMBUS channel pass by each RDRAM.
		The RAMBUS channel, on the other hand, gets longer as more RDRAMs are added to it, which means that the amount of time that commands and data must travel to reach the outermost device can get pretty high.
		The read delay value for each individual RDRAM chip is programmed via the control pins into one of those control registers that we met in the previous section.
	arstechnica.com /paedia/r/ram_guide/ram_guide.part3-6.html (1042 words)

	Computer Resource Center - Tech Corner (Site not responding. Last check: )
		RDRAM is a type of computer memory from a company called Rambus, inc. It looks much like normal PC100 or PC133 DIMMS (or DDR DIMMS), but it is not compatible with them, and it in fact operates in a significantly different way.
		This cost might be acceptable if it bought increased performance, but RDRAM simply does not outperform SDRAM by a significant margin, if at all (it is often enough slower).
		It is somewhat revealing that there are no RDRAM motherboards for quad processors, which, one would think, are most in need of its supposed performance edge.
	www.gi.alaska.edu /services/crc/crctech/03_2001_RDRAM.html (582 words)

	What is RDRAM? - A Word Definition From the Webopedia Computer Dictionary
		RDRAM is already being used in place of VRAM in some graphics accelerator boards.
		As of late 1999, Intel has been using RDRAM in its Pentium III Xeon processors and more recently in its Pentium 4 processors.
		In-depth analysis of Rambus' RDRAM aims to find its technological advantages and disadvantages, as well as reach a verdict on the SDRAM vs. RDRAM issue.
	www.webopedia.com /TERM/R/RDRAM.html (428 words)

	IBM Personal computing support - 256MB 800MHz ECC 16D RDRAM RIMM Memory - Overview (Site not responding. Last check: )
		To optimize the performance of the RDRAM technology, each channel is limited to 32 devices.
		The number of devices in each RIMM is indicated with a number followed by the character "D." The RDRAM signal channel is a high-quality terminated transmission line as contrasted with memory buses used in previous technologies.
		The 256MB 800MHz ECC 16D RDRAM RIMM is supported on systems that support industry standard RDRAM to the PC 800 memory module specification.
	www-306.ibm.com /pc/support/site.wss/document.do?lndocid=MIGR-4ECT8D (347 words)

	DDR II and Rambus RDRAM Info
		At first blush, this seems at odds with recent reports that RDRAM will not be in Intel's next generation workstations.
		There are indications, though, that RDRAM support will be limited to updates to the Intel 850 chipset, and it's likely that future core logic from Intel for desktop PCs may move away from RDRAM.
		Still, RDRAM looks to be the performance solution for Pentium 4 PCs for the next two years.
	www.gen-x-pc.com /ddrII_rambus_info.htm (2613 words)

	eBay Guides - RDRAM Made Simple
		But most importantly, RDRAM must be installed in 'like' pairs.
		RDRAM also comes in 1066 but it is not as commonly used.
		ECC is an error correction control built in to the memory module but can create more problems them you bargained for.
	reviews.ebay.com /RDRAM-Made-Simple_W0QQugidZ10000000000833544 (443 words)

	EETimes.com - Intel, Rambus mull overhaul for RDRAM
		Naono of Rambus acknowledged that an RDRAM memory controller is dependent on the DRAM's bank configuration; that's why Rambus decided to select a single, 32-bank standard for RDRAM, he said.
		At the same time, NEC's RDRAM yields have already surpassed 50 percent and are expected to improve as the company moves to 0.18-micron process rules — circumstances that may call into question the need for an architectural overhaul.
		The production plan for 128- and 144-Mbit RDRAM, meanwhile, was cut from 3 million to 1.5 million per month by December, while 256-Mbit RDRAM projections fell from 500,000 units to 250,000 a month by year's end.
	www.eetimes.com /story/OEG20000825S0065 (1577 words)

	Samsung PC800 RDRAM RIMM Memory Review - PCSTATS.com
		Rambus has introduced new 32-bit RDRAM which works in parallel and which will shorty free it from the old constraints.
		The new RDRAM RIMM 4200's cannot be used in single sets, but at the moment they are very not widely available.
		We are testing PC800 RDRAM manufactured by Samsung, and as it is the older 16 bit serial type, we need to install them in matching pairs.
	www.pcstats.com /articleview.cfm?articleID=1097 (480 words)

	Ace's Hardware (Site not responding. Last check: )
		Intel has indeed stopped RDRAM chipset development efforts and it is clear that DDR-II has a much brighter future ahead.
		After erasing RDRAM from their roadmap a few months ago, Elpida (NEC + Hitachi) has decided to go ahead with the PC1066 RDRAM production anyway.
		Many articles point out that RDRAM uses a 16-bit bus for the data signals and that this narrow 16-bit path is the main reason why RDRAM is able to run at speeds up to 533 MHz (DDR, effective clockrate: 1066 MHz).
	www.aceshardware.com /read.jsp?id=50000275 (934 words)

	RDRAM Vs. Dual DDR
		Some RDRAM geektards have taken some Granite Bay benchmarks and are jumping up and down saying that dual DDR is a big disappointment and this proves RDRAM is better.
		You would be a fool to choose dual DDR over RDRAM if all you were going to do is run it at 133MHz.
		Just like the RDRAM person, he'll say that this "fair" test will prove that the Mac G4 processor is more efficient cycle for cycle.
	www.overclockers.com /tips00277 (820 words)

	PC World - Rambus Exec Forecasts 1-GHz RDRAM in 2002
		Rambus expects to push RDRAM chips beyond existing frequencies of 800 MHz to 1 GHz and faster in the next few years, and is preparing in-line memory that supports throughput of up to 9.6 gigabytes per second within four years.
		Currently, demand for DDR is outpaced by RDRAM, but shipments of DDR memory will surge next year if Intel pushes the use of DDR chips in desktop PCs, says Ilung Kim, vice president of memory marketing at Samsung Electronics.
		By comparison, RDRAM accounted for 25 percent of Samsung's memory chip production during May and this is expected to rise to 30 percent by year's end.
	www.pcworld.com /news/article/0,aid,52884,00.asp (718 words)

	Rambus Memory - Samsung PC800 Rdram Rambus memory 184pin
		SAMSUNG Kit of 2 x 128mb total 256mb memory PC800 40ns Rdram Rambus 184pin ram memory upgrade.
		Samsung 512mb Kit of 2x256mb 40NS total 512mb memory PC800 Rdram Rambus 184pin rimms.
		Samsung 256mb ECC 40ns 533mhz (backward compatible with 400mhz) 184pin RDRAM Rambus memory.
	www.memorystock.com /Rdram-rambus.htm (352 words)

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