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	RAM latency - Wikipedia, the free encyclopedia
		RAM Latency is the amount of wait time that a computer experiences when trying to access data in its RAM.
		RAM latency is measured in front side bus clock cycles.
		Although the RAM latency timing can be adjusted manually, smaller values than those given by the RAM manufacturer is considered over-clocking but it may cause a computer to crash or not boot.
	en.wikipedia.org /wiki/RAM_latency (494 words)

	CAS Latency - Wikipedia, the free encyclopedia
		CAS is an acronym for column address strobe, or sometimes column address select, both referring to the column of the physical memory location in an array of capacitors (a grid comprised of columns and rows) used in dynamic random access memory modules.
		Latency refers to the amount of time, or lag, that is experienced in traversing a system.
		Taken together, the CAS Latency (CL) refers to the length of time, in clock cycles, it takes for a request sent from the memory controller to read a memory location and send it to the module's output pins.
	en.wikipedia.org /wiki/CAS_Latency (239 words)

	J!NX Forums - cas latency on RAM?
		pc2100 ram is all the same to me, but when you get into the 333mhz and 400mhz clock rates for ram pc3200+, it startes to matter and the cas settings as well.
		RAM latency refers simply to the ammount of clock cycles your RAM waits to do a particular task.
		because the RAM is dynamic, and not static (flash memory is a static memory) it requires constant "refreshing" of the data bits it has stored in its banks, refrsh "shots" of voltage going through it at a certain rate.
	www.jinx.com /forum/topic.asp?TOPIC_ID=15891 (1097 words)

	ExtremeTech: Does RAM Latency Matter?
		On the Athlon 64 system, decreasing RAM latency from CAS 3.0 to CAS 2.5 resulted in a speed boost from 1% to 3%, and further decreasing it to CAS 2.0 gives us a difference of 2% to 6%.
		Something about the way Halo is coded makes it highly sensitive to RAM latency, and we wouldn't be surprised if there were other games out there with similar properties.
		What's more, low-latency RAM generally stands up better to running at higher clock frequencies (sometimes with a slight increase in latency settings), and the biggest performance improvement almost surely comes from running some combination of lower-latency, overclocked RAM.
	www.findarticles.com /p/articles/mi_zdext/is_200408/ai_n7183843/pg_2 (1502 words)

	Performance Management Guide - Program execution model
		Usually, the time required to move from one hardware level to another consists primarily of the latency of the lower level (the time from the issuing of a request to the receipt of the first data).
		Operating systems try to keep in RAM only the code and data that are currently in use, storing any excess onto disk, or never bringing them into RAM in the first place.
		Typically, a RAM latency of dozens of processor cycles occurs between the time the hardware recognizes the need for a RAM access and the time the data or instruction is available to the processor.
	publib16.boulder.ibm.com /pseries/en_US/aixbman/prftungd/prfoverview2.htm (1669 words)

	Sudhian Media
		ECC RAM can detect errors (both single and multi-bit) and is able to fix single-bit errors “on the fly” and transparently to the end user.
		RAM can be Registered and not ECC, but since both features are typically demanded simultaneously, they are usually found together.
		Corsair’s 3200LL RAM is certified for low-latency operation (2-3-2-6) and specifically tested in the ASUS SK8N motherboard (the same board we used for testing today).
	www.sudhian.com /showdocs.cfm?aid=493&pid=1837 (605 words)

	[No title]
		However, your RAM needs to be able to handle the increased rate and may not be able to do this if the FSB is overclocked or the RAM is of a lower specification.
		Like CAS latency, it's a delay before you get your data, so while your system is faster at a lower setting, it's also more stressful at that setting.
		With a high RAM load (as mentioned in Delay DRAM Read Latch), the signal strength may be insufficient.
	arstechnica.com /guides/tweaks/bios.ars/2 (1043 words)

	Higher Bus Or Lower Latency - Discussion@SR
		With the advancement of RAM tech nowsadays, you can be sure your fastest, most expensive RAM now will be superceded by a faster and better quality version 3 months down the line.
		RAM wise and even CPU wise, you ain't gonna see as much performance difference over their last generation counterparts that justifies paying a premium unlike my examples above.
		So, while this effect of 'excess' RAM bandwidth exists, it doesn't make much difference, even in the extreme case where the RAM bandwidth is double that of the CPU FSB.
	forums.storagereview.net /index.php?act=ST&f=2&t=12889 (1228 words)

	PCWorld.com - Fast RAM Provides Low Value
		Fast RAM is almost never worth the money, unless you're a dedicated gamer or gearhead obsessed with wringing every last millisecond of performance from your system.
		Vendors list latencies for various memory functions; the first number is the CAS latency (CL), and when it's down to 2 on Intel-based systems (2.5 with AMD CPUs), you're really humming.
		Latency differences may give you only a 2 percent boost in system performance, says John Stroozas, Crucial's director of engineering.
	www.pcworld.com /news/article/0,aid,118372,00.asp (310 words)

	X-bit labs Community :: View topic - RAM CAS Latency Question
		So the absolute latency for a given module should be the same regardless of clock speed, although relative to the clock it will appear to vary.
		The general reason why you see a higher performance boost of slower ram when you make the CAS timings more agressive that is shown by the relationship of the amount of data processed by the ram per second in relation to the amount of data processed by the CPU per second.
		Although even with that ram there is a point at which it will start to fall over again, in this case you could probably go a little further by increasing the CAS (and spacing out the memory transactions a bit more to balance the compression being done by the memory speed increase).
	www.xbitlabs.com /forum/viewtopic.php?t=3270 (5853 words)

	Review: OCZ Performance Series SDRAM and Thermaltake Memory Cooling Kit
		Two flat RAM module heat sinks and clips to match, two spiky heat sinks suitable for cooling about half of the RAM chips on the average video card, double-sided thermal tape for attaching the sinks to the RAM, and a little badge so you can tell the world you're "Performance Cooled by Thermaltake".
		The RAM is commonly waiting for some other component, even if a task could otherwise be reading and writing to every chip on every module all of the time.
		The temperature difference between the probe on the RAM and another one sitting in the air away from the case was only eight degrees Centigrade.
	www.dansdata.com /fastram.htm (4075 words)

	MTGnews.com Forums - View Single Post - Tech Help Thread
		With this amount of ram you should be able to browse the net and listen to music at the same time.
		A 200mhz chip of DDR ram actually runs at 100mhz the reason it is listed at 200mhz is because DDR ram transfers data at the beginning and end of its signal to the CPU effectively twice, were as SDRAM only sends data once.
		DDR ram in general is backwardly compatible, Meaning that 400mhz Ram could be used in conjunction with a CPU that only has a frequency of 200mhz.
	forums.mtgnews.com /showpost.php?p=2549228&postcount=94 (935 words)

	TweakTown Global Forums - Cas Latency
		As for CAS latency, you'll basically have choices between 2, 2.5, and 3 (anything higher would be pretty bad).
		Many RAM modules will come advertised with inproper tRAS because of the common misconception that lower tRAS means more performance.
		If you are overclocking, it can be smarter to get RAM rated for higher speeds (or OCz Enhanced Bandwidth as it overclocks extremely well), but with worse latency.
	forums.tweaktown.com /showthread.php?t=18349 (618 words)

	Does RAM Latency Matter? - TechSpot OpenBoards
		But my Kingston (Value) Ram, is rated at 3-3-3-6, and it clocks perfectly at 2-2-2-5.
		So 60fps for a game should be enough but it is not due to the fact of latency induced by your input devices.
		As for this movie vs game fps, well, the basic CRT TV shows video at 35fps, though the source is broadcast at 60fps(this is assuming you are watching a movie or TV show on a network and not from a video disc) The end result is 30-35fps viewed by the user.
	www.techspot.com /vb/topic14907.html (1613 words)

	Do I need low-latency RAM?
		The CAS Latency of your RAM is basically the amount of time your RAM sits ‘waiting’ for an instruction from the processor, and has an impact on overall system performance.
		In terms of overall system performance, however, the CAS latency of the RAM is only one of many, many factors contributing to performance, and the difference between low latency and high latency RAM might only mean a performance difference in the low single-digit percentages.
		If that low-latency RAM is a significant increase in expense compared to the higher latency alternative, Paul, then under normal circumstances I’d suggest that the extra expense isn’t warranted.
	www.pcuser.com.au /pcuser/hs2.nsf/web/F2C5E761CD3211B2CA256EAA0030A1BF (486 words)

	SysOpt.com - RAM Technology Primer: CAS Latency
		Simply put, CAS Latency is a number that refers to the ratio - rounded to the next higher whole number - between column access time and the clock cycle time.
		It is derived from dividing the column access time by the clock frequency, and raising the result to the next whole number.
		Because the SDRAM specification calls for a maximum CAS Latency of 3, the worst-case scenario for overclocking to 83 Mhz.
	www.sysopt.com /tutorials/article.php/616091 (770 words)

	Sudhian Media
		Keep in mind that these tests are chosen because of their sensitivity to memory bandwidth and latency, the differences in performance they reflect may be exaggerated compared to other “real world” applications.
		There are many programs which are not RAM bandwidth or latency-sensitive, and which would care very little about the latency of the RAM used.
		Initial latency between all four RAM types is identical, but by the 512 bit mark, the difference in latency has grown to 13% from Kingston to Mushkin / Corsair.
	www.sudhian.com /showdocs.cfm?aid=493&pid=1837 (283 words)

	Geek.com Geek News - New low-latency DDR2-RAM outshines regular DDR-RAM
		But on the other hand, DDR1 uses these low latency figures at higher base clock rates, 200MHz for DDR1-400, opposed to 133MHz for DDR2-533, which means even equal latency numbers on the DDR2 RAM will result in worse latencies than DDR1, until the base clock speeds catch up.
		This is also why you see "worse latency" on "higher bandwidth" modules in general: the PHYSICAL amount of time that it takes to translate an address into column and row precharge, sense and decodes is pretty much fixed regardless of I/O clocking (for a give chip architecture, process and so on).
		The only thing you would gain from the extra frequency of the 667 would be minor latency improvements given the same timings(unlikely) or a lot of overclocking headroom to overclock your board.
	www.geek.com /news/geeknews/2004Dec/bch20041222028369.htm (1946 words)

	DriverHeaven.net - Wow CAS 2 / 2.5 /3.0 only very small diff?
		Most users eagerness for supertweaking RAM latencies come from using theoretical benchmarks like SiSoft Sandra, in wich a substantial difference in score does not relate directly to real world performance gains.
		The longer the system is running, the more it utilises the RAM for various things, some of wich become noticeably slower in a fresh bootup situation.
		I think a lower CAS latency doesn't dramatically alter system performance; but for the die hard gamers who want everything out of their system then the lower CAS latency is prefered.
	www.driverheaven.net /showthread.php?t=57017 (1232 words)

	Does RAM Latency Matter? - ExtremeTech Discussions
		Posted: 08-19-2004, 4:18 PM While I've heard rumours that low lantency ram is the desire of every over clocker and supposedly the holy grail of overclocking stability, the conclusion that CAS 2.0 ram is a good buy for overclockers is supurious and simple not support by any information in the tests.
		The point was to isolate RAM latency by itself and see what performance difference it makes in "normal" high-end systems.
		For those who spend well over $2,000 building their dream machine, the cost increase of high performance RAM is a worthwhile investmentor extreme enthusiasts and the overclocking set, the story is a bit different.
	discuss.extremetech.com /forums/608512001/ShowPost.aspx (1507 words)

	[H]ard\|Forum - Is low latency Ram worth it?
		I'm not familiar with the ram but what are the timings on both pairs of ram.
		The low latency high performance RAM is usually for the most demanding user, who also tend to overclock.
		The trick with low latency ram really is that you can usually increase the latency from say 2-2-2-5 to 3-3-3-8 or something, add a little voltage, and get it to run well over rated speed.
	www.hardforum.com /showthread.php?t=780211 (997 words)

	pc ram vs. mac ram - MacNN Forums
		This relates to the latency of the RAM (ie.
		In the PC world, you can set the RAM latency at the BIOS (boot ROM) level, so if you mix CAS2 and CAS3 RAMs, and you set the latency to 2, you are just over-clocking the CAS3 RAMs.
		However, since you cannot change the latency on the Mac, depending on the design of the motherboard(?), the resultant speed might be CAS6 (LCM of 2 and 3).
	forums.macnn.com /showthread.php?t=48680 (494 words)

	What is RAM latency? - A Word Definition From the Webopedia Computer Dictionary
		A delay in transmitting data between a computer's RAM and its processor.
		Since RAM is not necessarily fast compared to the computer's processor, RAM latency can occur, causing a delay between the time a computer's hardware recognizes the need for a RAM access (initiates a request for data) and the time the data or instruction is available to the processor.
		If the CPU requests data that is not stored in the cache, then it will have to wait for the RAM to retrieve the data, opening the door to latency problems.
	www.webopedia.com /TERM/R/RAM_latency.html (168 words)

	Computer Technology Forum - CAS-Latency on ram...
		So in the link it said that cas latency 2 is better than 3.
		I maybe jumping the gun but does it mean for example, cas latency 2 performs on 2 clock cycles.
		the lower the latency the faster the response is. the only thing that i consider when getting memory is installing the fastest memory type (pc2700, pc3200) that the motherboard supports.
	www.tech-forums.net /showthread.php?s=&threadid=18272 (403 words)

	TweakTown Global Forums - Low Latency Ram
		It mostly depends on the situation but generally low latency RAM is not worth it.
		It would be better to buy cheaper RAM and buy the next level video card or something.
		The only reason to get expensive RAM such as low latency is for overclocking or if you are a benchmarker where even a couple points higher would make a difference.
	www.tweaktown.com /forums/showthread.php?t=18925&page=2&pp=10 (489 words)

	RAM latency..... - CGarchitect.com
		I'm not sure of all the technical stuff, but latency is basically how many cycles it takes for the processor to fully access the memory.
		The lower the better, and the RAM with the 2-2-2-5 timing will take 2 cycles for the CPU to access the RAM, where the 3-3-3-8 takes 3.
		Most of the cheaper RAM has ratings of either 2.5 or 3 cycles and the more expensive RAM is rated at 2, but for some reason they can only get timings down to 3 for 1GB sticks.
	www.cgarchitect.com /vb/showthread.php?t=9581 (340 words)

	Ram latency vs. raw speed - TechIMO Forums
		Ya high latency is a great idear there isnt it.
		Hm....seems like Latency is over the bandwith...but the article seems pretty old.
		the RAM I recommended can run at awsome CAS at lower speeds, the CAS specified on the site is when the RAM is running @250MHz (ddr500).
	www.techimo.com /forum/t135047.html (1170 words)

	TweakTown Global Forums - Low Latency Ram
		Lower settings may notice a a small jump, but considering the price of low latency RAM vs. something like Corsair Value Select it is definitely not worth it.
		If you are overclocking then don't even consider Corsair Value RAM or any other Value RAM as it won't overclock very well at all.
		Most people are still using their Athlon XPs and Pentium 4s (if not something older), in which case lower-latency RAM can be noticably beneficial for both overclocking and stock performance.
	www.tweaktown.com /forums/showthread.php?t=18925&page=2&pp=10 (403 words)

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