What is the different between SODIMM and SDRAM notebook memory ?
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SODIMM is made (mostly) specifically for laptops.  SDRAM is a slightly older type of memory (PC100, PC133 anyone? :).\n\nIf you're looking to upgrade a notebook, search by the model number to find out exactly what type of ram, maximum speed, size, and slots it can accomodate.
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Static RAM and Dynamic RAM
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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.
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Installed RAM  512 MB  \n  \nRAM Technology  DDR SDRAM  \n  \nMax Supported RAM  2048 MB  \n  \nRAM Speed  333 MHz  \n  \nInstalled Cache Memory  2048 KB
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i can't seem to find this in a google search, but find out what kind of socket it is...DIMM is for desktops, and SODIMM is for laptops.
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2 types: static & dynamic.\n\nDynamic, like memsticks you see, come in SDRAM & RDRAM are cheap and hi-density, but require refresh, which makes them slow.\n\nStatic, more expensive per byte, but blisteringly fast, require no refresh and are restricted to use in cache & CPU-related activity.
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OK, this is the actual procedure, read carefully.\n\nIf you have already bought the RAM, skip this paragraph and go to the next step. If you have not bought it yet, just remove your old one and take it to the shop. Tell them you want the same type of RAM but in a different/same capacity. This saves you alot of trouble telling them whether it's SDRAM or DDR RAM. Just bring the sample.\n\nThere is no installation involved. You just need to put the new or additional RAM into the DIMM slot(there is only one type of slot for RAM so you can't go wrong) and start your computer, that's all. The computer will automatically calculate the new size of the RAM and adjust itself automatically.\n\nIf you are still unclear, do not hesitate to post here. Good luck!\n\nCheers!\nALWAYS LOOK ON THE BRIGHT SIDE OF LIFE
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64-bit memory chip\n\n=D
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GDDR3 SDRAM\n\nFOR 2M x 32Bit x 4 Bank GDDR3 SDRAM\nThe 8Mx32 GDDR3 is 268,435,456 bits of hyper synchronous data rate Dynamic RAM organized as 4 x 2,097,152 words by 32 bits, fabricated with SAMSUNG’s high performance CMOS technology. Synchronous features with Data Strobe allow extremely high performance up to 5.6GB/s/chip. I/O transactions are possible on both edges of the clock cycle. Range of operating frequencies, and programmable latencies allow the device to be useful for a variety of high performance memory system applications. \n\n>>>>>>\n\nXDR DRAM \n\nWith requirements for faster computing power increasing on a daily basis, companies are working hard on developing components that breaks the limits set by current hardware. Samsung is one such tech giant who has now started production of memory chips, which it claims is the fastest RAM in the world. The chip is Samsung 256 MB XDR DRAM where XDR points to eXtreme Data Rate. \n\nThis RAM module features an Octal Data Rate process, which lets it transfer data at around eight bits per clock cycle. This enables it to transfer data at a speed of 8gbps. Samsung claims that the RAM module performs 10 times faster than traditional DDR 400 memory and around 5 times faster than RDRAM (PC800) memory sticks. \n\nSamsung is aiming this particular RAM module at highly intensive gaming and graphical environments like gaming consoles, servers and of course Digital televisions. Workstations used for high-end graphical applications would also benefit from this product from the stables of Samsung. A senior representative at Samsung Semiconductor Mueez Deen told the media about this product: “XDR technology has tremendous potential to become a leading memory solution for today’s highest performance multimedia applications, and we are quite enthusiastic about its prospects”.\n\nThis is not the end of Samsung’s current plans. They plan to introduce an even faster RAM module 512 MB XDR DRAM during the current year, which would be capable of data transfer at 12.8 gbps.
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DDR RAMs will not fit in a SDRAM slot. For utmost details:\nhttp://computer.howstuffworks.com/ram.htm
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The difference in memory installed is probably being used by your video card.  It looks like around 22MBytes.
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they are 2 different Ram formats ... SD Ram is older and is identified by 2 notches along the contact edge where DDR Ram only has 1 notch approx in the middle ... You CAN NOT place SD Ram into a DDR Ram DIMM or vice-versa
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Mostly, u have 2 check the type of ram supported by both computers. Most recent compiters support DDRII RAM Technology which supports DDR one RAMs. But if the old memory is SDRAM, it might not be suppoted by the newer laptop. A DDR one RAM will mostly be supported by new ACERs and DELLs.\n\nNext time, if u need help through such an open community, where no one knows any thing bout ur laptop, better specify the laptop model number, or mention the main features such as the RAM type and size.
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LOL DDR and SDRAM are two totally different things.  DDR is Dual or Double Data Rate.  SDRAM is Synchronous Dynamic RAM.  You can have DDR SDRAM.  You need to find out if your computer supports DDR or SDR (single data rate), then see what the max allowable size for each memory bank is on your PC.  If it supports up to 512MB and DDR, you should be able to use it.  Also, the speed comes into factor.  What speed of RAM does your motherboard support PC 2100, 2700, 3200, etc?\n\nDDR SDRAM\nSDR SDRAM  \n\nconfusing because of the SDR acronym in both Single Data Rate and Synchronous Dynamic Random...  this is why you are getting icorrect answers.
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You get single sided and double sided memory modules. there is the possibility that your motherboard cannot take double sided memory (single sided is more generic). if the memory module has little chips on both sides of the module, then it's double sided. you should install each memory module you have, one at a time, on it's own to check that your computer can 'see' it.   \nAlso, install one module that works into both slots on the motherboard to check that both slots are working. check your bios settings for ram speed, set to 100 not 133
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DIMM's are dual in-line memory module. SIMM's are single in-line memory modules.\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.\n\nRIMM's are Direct Rambus DRAM or DRDRAM (sometimes just called Rambus DRAM or RDRAM) is a type of synchronous dynamic RAM, created by the Rambus Corporation. They're the same thing as DIMM's, except they're faster, and have built in error checking. They were very expensive at first, and no major computer manufacturer uses RIMM's.
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SDRAM stands for Synchronous Data Random Access Memory. It synchronises to the pc bus speed. DDR SDRAM is Double Data RAte Synchronous Data Random Access Memory. Theres no DDRAM. DDR SDRAM can be accessed by the system on both the upside & downside of a clock cycle. Standard SDRAM can only be accessed on the upside of a clock cycle. The 2 types of RAM are not compatible, your system will use one or the other. Of course theres now DDR2 memory. Not sure whats different about it, I beleive its just faster. A good resource for PC terminology is www.webopedia.com.