Learn more about the various types of memory or RAM, such as DDR, DDR2, DDR3. SDR SDRAM modules are usually made in a 168-pin form factor for. RAM upgrades: Watch for high- and low-density requirements. By Joe Rosberg in User Support, in Hardware. And if you use high-density RAM in a system that requires low density, either the.
I need to enhance Memory of my laptop computer, a Lenovo Ideapad Con510. The type element of RAM given right here is usually 'SO DIMM 200-pin'.
I possess two choices, initial and second. My issue is definitely: both are of kind DDR2 2GC 667MHz but the 2nd one clearly brings up 'SO DIMM' while very first does not really.
Will the very first one match in my device?
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4 Answers
Simply because much as I know, SODIMM is usually for laptop and DIMM is definitely for desktop. Proceed with the SODIMM. The reason why there is certainly a distinction between Memory for laptop computer and desktop computer is electrical, high temperature and economcial.
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The problem here is certainlyNOTone of trying to number out the difference between the two Ram memory supplying. The problem here is usually thatbothare usually eBay listings, and not really subject matter to high quality control mainly because considerably as what the individual promoting the item actually sorts when they listing the item.
Yes. Laptop computers use SO-DIMM memory. And. if you had been to go by the photos supplied for both listings, after that BOTH of the items are SO-DIMM, as they are usually both the same size (physically), have the notch in the exact same place, both produced for notebooks, etc.
If it'beds produced for a notebook, it'beds SO-DIMM. If it'h produced for a laptop computer, this does not mean that the individual position the memory for selling is smart good enough to include that (when it's not noticeable on the packaging).
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Thus stands for 'little put together' which can be what is utilized in most laptops and some desktop computers (quite a few Apple computers). Attempt Wikipedia: http://en.wikipedia.org/wiki/SO-DIMM.
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SODIMM are usually supposed for laptops. DIMM received't also match in the slot offered in the motherboard. Also if you want to choose a great RAM, create sure the frequency matches your earlier installed RAM and fits your motherboard
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Over the years, IT pros have noticed different systems come and go-ánd some that just stubbornly refuse to perish (floppy drives, anyone?). One region that's changed drastically over the decades is memory space. From SIMMs tó DIMMs to ED0 to Rambus, Memory has arrive in all shapes and dimensions and is certainly definitely not a 'one size fits all' business. In this article, I'll go over the different kinds of Memory that provides made its method into systems over the years. If you discover a stick of RAM laying somewhere in a cabinet, or need to know just what makes DDR and DDR2 RAM various, you'll possess a benchmark.
Conditions you should understand
Before embarking on a storage dialogue, you should be aware of a few conditions that will pop up during your reading to make it easier to adhere to:
- ECC (Mistake Checking and Modification): ECC is usually a type of parity chécking in which á little bit is included to a information stream to verify for mistakes. While this could effect in a very small overall performance hit, it boosts the general dependability of the system.
- CAS (Line Accessibility Strobe): The CAS value is simply a fancy method of asking how several system clock cycles the Memory control waits before it places the information on the memory space tour bus before sending a sign that the memory space can be read through. A lower CAS value indicates there is definitely a shorter wait around, causing in faster storage gain access to.
- Wait claims:One factor of old memory technologies that is usually long gone from newer memory space types can be the 'wait state'. Before the advancement of SDRAM, which runs at speeds synchronous to thát of the system, RAM has been asynchronous, indicating that it rán at a different speed, usually slower than the program. This supposed that the system acquired to put in 'wait around expresses' into the RAM access routine to accommodate this mismatch in time. As you can probably picture, this lead in a performance hit since these wait states had been simply filler. Occasionally known to as the 'entry period', these efficiency hits could range anywhere from 40 to 120 nanoseconds.
- Registered:Registered Ram memory delays details sent from Ram memory by a clock routine, allowing Ram memory quests of a bigger capability to become installed in the program. The trade-off is definitely performance, nevertheless, as unregistered RAM does not really bill this delay.
SIMM (Single Inline Memory space Module)
An old kind of Ram memory that you received't discover in today's PCs is usually the SIMM, short for Solitary Inline Memory space Component. SIMMs arrive in two major types: 30-pin and 72-pin tastes. A 'pin' will be one of the yellow metal- or tin-plated fittings that can make electrical contact with a corresponding pin in the memory space slot. Relating to this conduction material: don't combine them. If you possess an old pc and are usually adding Memory, don't place tin-plated sticks of Memory into a gold-plated slot. Mixing the alloys like this can make it less difficult for the steel to rust and wreck both your Memory and perhaps your mothérboard.
SlMMs are usually notched on one aspect so you can quickly tell in which direction the component demands to become installed in the slot. A 72-pin SIMM will be about 4.25' broad and around 1' high, but the height can vary between suppliers.
72-pin SIMMs make use of a 32-little bit data route (36-bit for quests that assistance error checking) to transfer data between the RAM and the program in which they're installed. 30-pin SIMMs possess an 8-bit data route (9-little bit for ones that support párity).
A 30-pin SIMM uses 5V of electric power while a 72-pin component uses possibly 3.3V or 5V. 30-pin modules arrive in sizes up to 8MN while 72-pin varieties can end up being simply because large as 32MM.
Body A
Number T |
Thé number of potato chips on the module is odd, suggesting a parity mistake checking component. |
Figure M |
Discover the notch on this 72-pin SIMM. It helps to straighten up the module in the Ram memory slot machine. The notch in the center is various based on the voItage of the module. This helps to avoid harm by stopping the wrong voltage module from becoming utilized on a panel. |
DIMM (DuaI Inline Storage Module)
DIMMs had been a successor to SIMMs and have 168 pins across the underside of the Ram memory stick, with 84 on each aspect. DIMMs operate using a 64-bit data path, causing in twice the overall throughput of older SIMMs. DIMMs have two notches along the base of the stay in order to assist with properly orienting the stay in the storage slot.
Physique M
Figure Age |
SO-DIMM (Little Format DIMM)
One type of DIMM that is definitely common in laptop computers is usually the SO-DIMM, the Little Outline for you DIMM. Called because of it's smaller dimension (2.66' broad for the 144 pin range used in today's laptop computers or 2.35' broad for the 72-pin SO-DIMM Ram memory utilized in older devices), a SO-DIMM has a little notch along the underside of the stick to help you orient the nick. Whereas DIMMs are usually usually set up at á right-angle tó the program table, SO-DIMMs are usually usually installed at an position to help save room in the system, which will be useful in little spaces like as notebook instances. SDRAM SO-DIMMs work on 3.3V of electricity.
MicroDlMM
Obtainable in 144-pin SDRAM and 172-pin DDR (find below) varieties, a MicroDIMM will be smaller sized than a S0-DIMM. At simply 1.50' across, an SDRAM MicroDIMM eats 3.3V of latency and pushes 2.1GBps of data through. The 172-pin DDR variety uses 2.5V.
DDR2 (see below) MicroDIMMs with 214 pins are furthermore making their method to the memory space market and require 1.8V of energy.
Shape Y
RIMM - Rámbus Inline Storage Component
Along the method, some dealer proprietary storage modules have got discovered their method into some Computers and computers. The principal culprit in this world will be the RIMM, ór Rambus Inline Storage Component. RIMMs had been created by Rambus, usually in the news as a result of their propriétary RAM.
RlMMs possess 184 pins along the bottom of the outlet table, with 92 pins on each aspect of the table. Rambus quests use a 2-byte data sales channel that facilitates transfers of upward to 1.6 Gigabyte per second. That'h pretty darn fast, although newer sorts of DIMMs possess paved the method to faster storage varieties. RIMMs architecture does not really provide itself to á low-heat operation. In reality, if you appear at a Rambus memory space stick, you'll see a azure item of metal addresses all of the potato chips. This steel isn'testosterone levels simply to make the nick look cool; it'beds tomaintainit awesome. Rambus storage creates a great deal of temperature and the azure metal assists to diffuse that high temperature.
Body H
SO-RlMM (Small Format RlMM)
Liké their DIMM countérparts, RIMM segments have got a smaller sized small outline partner. In this situation, RIMM's is known as a SO-RIMM. Wearing 160 hooks (80 on each side), a SO-RIMM can be great for make use of in limited areas. The smaller SO-RIMM also provides the glowing blue metal heat spreader to assist keep the nick cool plenty of to function.
Storage forms
The earlier three headings covered specific memory form factors, but didn'capital t talk as well much about the method the RAM actually works. The following sections move over the various kinds of RAM you might discover in your program.
FPM (Quick Page Setting)
After old SIMMs required hold, technical engineers began to improve them. One like improved lead in FPM-Fast Page Mode-RAM. Contrary to its title, FPM Memory is simply no longer regarded quick! FPM Memory is not really appropriate on techniques with a tour bus speed of greater than 66MHz. Some old DIMMs also help FPM. These DIMMs operate FPM using either 3.3V or 5V of energy. The notch at the bottom level of the module decides the voltage. A 5V module's level received't along with a 3.3V memory slot machine, for instance.
EDO (Extended Data 0ut)
ED0 SIMMs had been a technology that arrived just after FPM RAM. EDO RAM was nevertheless SIMM-based technologies, but allowed a storage procedure to begin simply before the final operation was complete, ending in a small performance improvement ovér FPM RAM.
Fór quite some time, EDO has been the memory of selection in techniques, until the arrival of the DIMM-DDR Memory in particular. EDO demands assistance from the program's chipset and won't work without this support. Also if EDO RAM does happen to work in a non-EDO system, it earned't end up being capable to use its newer features, such as getting able to begin an procedure before completing the final.
Some old DIMMs furthermore support EDO. These DIMMs operate EDO making use of either 3.3V or 5V of power. The level at the bottom level of the component decides the voltage. A 5V module's level received't along with a 3.3V memory slot machine, for example.
SDRAM (Synchronous Dynamic RAM)
A newer kind of DIMM, SDRAM looks almost identical to an old universal DIMM, but provides quicker retrieval of data from the less RAM potato chips on the memory stick. SDRAM sticks still have 168 hooks for the storage slot connect, with 84 on each part. The 'synchronous' component of the SDRAM title helps keep the memory space in sync with the system processor, ensuing in a faster price of data move than that afforded by old types of Memory.
The list below provides details about the three common sorts of SDRAM as displays you the clock quickness and the information transfer price afford by each component.
- PC66: 66 MHz, 528MB/s
- Computer100: 100MHz, 800MN/s
- Computer133: 133MHz, 1.1 GB/s
- DDR266/Personal computer2100: 2.1 GB/s exchange @ 266Mhz
- DDR333/Personal computer2700: 2.7 GB/s move @ 333Mhz
- DDR400/Personal computer3200: 3.2 Gigabyte/s move @ 400Mhz. (a great deal of novels lists this as thé fastest DDR Ram memory accessible)
- DDR433/Computer3500: 3.5 Gigabyte/s exchange @ 433Mhz
- DDR466/Personal computer3700: 3.7 Gigabyte/s transfer @ 466Mhz
- DDR500/Computer4000: 4.0 Gigabyte/s transfer @ 500Mhz
- DDR533/Computer4200: 4.2 Gigabyte/s exchange @ 533Mhz
- DDR2-533/PC2-4200: 4.2GM/s @ 533MHz (8.4GN/s with double channels allowed)
- DDR2-667/Personal computer2-5300: 5.3GM/s @ 667MHz (10.6GT/s with dual channels enabled)
168-pin SDRAM modules function at 3.3V or 5V.
DDR SDRAM (Two times Data Rate SDRAM)
0ne of the néwest upgrades to the DIMM class is certainly the DDR module. DDR Memory is fairly standard in today's desktop and server computers, aIthough DDR2 SDRAM (explained Iater) is starting to display up in some techniques.
DDR Memory modules are usually able of managing two operations per clock cycIe-twice that number of operations as older sorts of SDRAM. This helps to clarify where DDR gets its title.
DDR SDRAM looks identical to normal SDRAM, except it offers 184 pins utilized for the motherboard link and provides two notches on each part of the module. The level along the base of the component in a DDR module is furthermore slightly various from those for additional SDRAM modules and there will be only once such level current on a DDR module.
A DDR module is comparable in size to an older SDRAM component at around 5.25' wide and 1.25' in elevation, although the height may differ based on manufacturer. Only memory slot machine games on motherboards developed specifically for DDR Memory will take a DDR module as a outcome. DDR SDRAM, like various other SDRAM, furthermore uses a 64-bit data tour bus to provide data to the major program. DDR Ram memory runs making use of 2.5V of energy.
There are usually a quantity of varieties óf DDR SDRAM on thé marketplace. The list below shows the title by which numerous companies market the product and clarifies what these rankings mean. Not all of these speeds are 'recognized'. That is certainly, there's not always chipset support for some of the really quick DDR rates of speed, although supporters of overclocking have got managed to get some of these efficiency numbers and some vendors do market memory modules at the higher speeds for these enthusiasts. DDR is usually able of delivering dual information channels, resulting in double the memory throughput.
The math for DDR RAM goes Iike this:
For example, DDR 266 (PC2100) offers a clock acceleration of 266,000 Hz (266 MHz). 8 bytes = 2,128,000 Bps or about 2.1 GB/t.
Additional DDR Rates of speed consist of:
Amount L |
Physique I |
An contour of á DDR 184-pin non-ECC storage component |
Amount M |
DDR2 SDRAM
As óf this composing, DDR2 SDRAM is definitely striking the marketplace. DDR2 begins where DDR still left off and supports frequencies of 400MHz, 533MHz, and 667MHz. The DDR2 type factor includes additional hooks not found on DDR modules. DDR2 sports activities 240 hooks-120 per side-and runs on less power than older DDR RAM-1.8V to be exact. This results in memory that doesn't require as much power and furthermore operates cooler. A DDR2 component can be about 5.25' broad and usually around 1.2' higher, although the elevation may differ.
Bécause of these differences, DDR2 SDRAM will not function in a DDR slot machine. More, the program chipset must include assistance fór DDR2 RAM.
Liké DDR, DDR2 SDRAM sports activities a 64-bit data route, or 72-bits wide for authorized or ECC storage modules. Further, DDR2 SDRAM can create make use of of double data channels, with suitable chipset support, giving a 128-little bit data path to the system, causing in enhanced RAM efficiency.
The list below sets out the three main DDR2 lessons. Expect more to be added a are generally DDR.
Number K |
Physique D |
DDR S0-DIMM (DDR Little Outline for you DIMM)
By now, you understand that the SO part of á DDR SO-DlMM means that it'h a little outline form factor used most in laptop computer systems and various other small gadgets. Some other than bodily dimension, the some other primary difference between á DDR DIMM ánd a DDR S0-DIMM is certainly the quantity of pins that link the stick to the mothérboard. A DDR S0-DIMM offers 200 like contacts-100 on each part. DDR ánd DDR2 SO-DlMMs gauge about 2.66' wide and 1.25' tall.
Body M
This is a tough area to write as there are a amount of variables and some Ram memory manufacturers have got elected to not printing anything on a storage module, producing it quite hard to completely recognize.
I've already provided some ways throughout the article that you can quickly identify modules by sight. Nevertheless, all these tips tell you will be the general kind of RAM found in the system-i.e. DDR, SIMM, étc. You might want to attempt to end up being capable to inform if the Ram memory you're holding can be a 256MM stay or a 1GT stay, or whether it'h ECC-enabled or might be registered. Right here are some guidelines I've gathered from all over the place to assist you in your id attempts.
As yóu can probably tell, there have been a amount of various varieties of Memory through the yrs. This can be by no means intended to be a 100% comprehensive manual to all things memory associated. To put together such a information would just require as well much space to become usable. Rather, this is definitely meant to provide a fast summary to some of the segments you might operate across and tries to assist you determine what you already possess on hands.