I wish to purchase a laptop. Some computer manufacturers and models offer memory of, say, 512 MB DDR2 SDRAM 2 DIMMS while others have 512 MB DDR2 SDRAM 1 DIMMS. Similarly, some models mention the above memory ending with SoDIMM. I want to know what is the difference between them so that I can buy the right computer
200386
The differences between these memory chips are speed, types, and compatibility.  In addition to the DDR (double data rate), there is also speed, usually follow by DDR3200 or DDR4200.  The higher the number, the higher the speed.  You should check what is the maximum the memory the laptop can take. Most laptops only allow memory upgrade up to 2 Gigs.
603208
I like to use crucial.com. They have reasonable prices, and the RAM is guaranteed to work with your computer.
208630
ddr and sd ram are both synchronous -- meaning that\nrather than responding as soon as an input signal\nchanges, they respond based on a clock cycle.  sd ram\ncan respond once per clock, whereas ddr (double data rate)\ncan transmit data on both the rising and falling edge of\nthe clock.\n\nddr2 is the same design as ddr (synchronous, both edges),\nbut it has been modified to run at a higher clock rate.\nFor large transfers, it can simply transmit more data\nin a fixed amount of time.\n\nYour computer was designed for some fixed types of memory.\nIf it was designed for a synchronous interface, then\nyou had better use synchronous memory.  Similarly, if\nit was only designed for only ddr memory, then it's not \nlikely to work with ddr2.\n\nAs for mixing *sizes* of memory, let your machine specs\nbe your guide :-)  I have worked on servers which required\nmemory to be installed in banks of 2 or 4 slots at a time\n(and each of those had to be identical).  On the other\nhand, I have a 256MB and a 512MB in an old laptop, and\nthat works fine.  My point is that where ever you buy \nyour memory should be able to look up what is supported\non your particular machine.
86631
A megabyte is 1024 kilobytes. RAM is random access memory. Everything you do on your computer goes through RAM. 256MB is the bare minimum for most modern operating systems. You can buy 128MB modules, but for a few bucks more you can gat 256MB modules. Price is dependent on the system. Is it a PC or Mac? Laptop or desktop? What brand? Do you have any open memory slots? What type/speed of memory? If you go to my link, you can do a memory search.
224686
Find out what type of ram your computer uses, DDR is Dual or Double Data Rate. SDRAM is Synchronous Dynamic RAM. Then find out the maximum it can handle. Then split the max. allowable by two and buy two boards equaling the total allowable. Also check the speed of the ram that your computer can accept (PC3200,etc.). RAM doesnt need drivers or anything else to run properly.
352913
Effectively, no.  PC133 is SDRAM packaged in a DIMM.  (See the Wiki page in the sources if you want more information.)\n\nIf you're intending to upgrade, assertain how much memory you can install in your PC and then ask for whatever number of megabytes of PC133 that you want prior to handing over your pennies.  The vendor will know what you mean.
114466
A DIMM, or dual in-line memory module comprises a series of random access memory integrated circuits. These modules are mounted on a printed circuit board and designed for use in personal computers. DIMMs began to replace SIMMs (single in-line memory modules) as the predominant type of memory module as Intel's Pentium processors began to control the market.\n\nThe main difference between SIMMs and DIMMs is that SIMMs have a 32-bit data path, while DIMMs have a 64-bit data path. Since Intel's Pentium has a 64-bit bus width, it required SIMMs installed in matched pairs in order to use them. The processor would then access the two SIMMs simultaneously. DIMMs were introduced to eliminate this inefficiency. Another difference is that DIMMs have separate electrical contacts on each side of the module, while the contacts on SIMMs on both sides are redundant.
166272
According to the HP website info for that model, it can be upgraded to a maximum 512 MB. It takes PC133 SDRAM and has 2 DIMM slots. (Note: While it can physically hold 2x 512, it may not be able to address the 1GB of memory if installed.)\n\nSo you'll have to get a couple of 256MB SDRAM 133MHz PC133 and put one into each of the slots.\n\nNote: Before you go shopping, check what's there currently. The specifications for that computer said that it came with 256, but didn't say whether that was in the form of 1x 256MB module, or 2x128 MB module. If there is a DIMM slot still free, then you only need to get one more module and add it in. If not, then you'll have to pull out the 2x 128MB modules and replace them  with 2x256MB modules.
1984
I would recommend going to http://www.crucial.com/index.asp and using their memory finder if you ever have another question like this.  They also have an auto detect memory feature (see sources) if you don't know the model number or it's a custom built computer.  Once you know, then buy it cheaper somewhere else like newegg.  Give a man a fish and all that...
73163
Get 512 Mb, or more if you can afford it.   Ideally you want to the the memory on 1 stick, not 2, to conserve the slots on your motherboard for future upgrades.   Be sure to buy the correct type of RAM for your motherboard.
488314
go to www.crucial.com\nthere you will be able to find out your memory type\nmost probably a small software will be downloaded\nthe execution of that small software could result in telling you the type of RAM your system can accept\nok
407955
Ok, I think you're getting a bit confused.  What you're talking about (DDR2 SDRAM) is RAM.  2gb, frankly, is more than you'll ever need, unless you're planning on doing SERIOUSLY high end graphics work (cinematic size and quality).\n\nWhat you really need to be asking, is how big the hard drive is.  I'm guessing with that much ram, it's probably 120 gig or more, which is almost certainly going to be enough.\n\nNow, should you decide you really do want more RAM, I'd suggest www.ebuyer.com.  eBuyer sell many different kinds, and you can read reviews on each one too.  Again, go and see them if you want a bigger hard drive.\n\nIn the case of pc hardware, it really is a case of "you get what you pay for" so if you want something serious, spend more money.
11098
It depends on what kind of computer you have, but you can probably either add a 256 or replace with a 512.  If you're willing to buy a 512, then why not just add it to the 256 and make 768?  That's what I did with my wife's laptop and it's just fine.\n\nAre these DIMM's or SODIMM's?
653317
Whenever you upgrade your memory, you should take into consideration the number of slots you have,\nwhether you plan to upgrade again in the future, and the current prices for memory modules. Because\nthe memory market can fluctuate quite a bit, it is sometimes less expensive to purchase a higher\ndensity part, like a 128MB module, while at other times it is less expensive to purchase two lower\ndensity parts, like two 64MB modules. If you are planning to keep your system for several more years\nand think you might want to add more memory later, look at how many open slots are left in your\nsystem. If you have quite a few open slots, it probably doesn't matter whether you buy the low- or\nhigh-density modules. However, if you only have one or two open slots left, you may want to purchase\nthe higher density module now.
102388
Discrete memory means the video memory is not used from the computer's memory (RAM). It will come with its own memory. \n\nGraphics card with discrete memory will perform better. \n\nIf you buy a laptop say 512MB RAM with shared graphics memory of 128 MB, this effectively means that the available RAM for other process will be 396 MB.
533134
There are thoudsands ones. And over 90% mainboard support for DDR (DDR1 as you said), which may also support DDR2.  We have other 2 types are DRam and Ram Bus, but they are "pasted" way.\n\nJust read the information on the wrbsites of these companies, you will know what type of memory they support
415016
There is a program called aida32 that allows you to see every minor detail of all that or you can crack open your computer and on the RAM cartridge there should be a label somewhere saying what type it is and how much, for example: DDR 2GB or something along those lines. Be careful not to damage it though.