wot is the difference btwn ddram and sdram, and how much more effective is ddr2 than ddr? \nAlso, why am i advised against mixing memory - for example, i currently have a 512 module and 1 more free slot. my frend said i cant put in a 1gb module, only a 512.
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.
367418
The first one is faster than the second one.  533Mhz > 400Mhz.  I would trust crucial.com.  Although both will work for your system.\n\nAlso, buying from a major brand is always better than buying generic.  The memory will perform much better.\n\nAlso again, if I were you, I would look into getting a 512mb stick of RAM instead of the 256mb.  That would give you a grand total of 1024mb or 1gb of ram, which is what I would recommend to take full advantage of that system.\n\nGive this a try . . . http://www.newegg.com/Product/Product.asp?Item=N82E16820231038\n\nAnd to the answer above, yes SODIMM has a 200 pin version.  http://en.wikipedia.org/wiki/Sodimm
505581
Excellent deal here.  The purpose of the double RAM set is that the computer will be reading faster, and this takes the stress off of just using one chip.  You will have plenty of speed with this demon, and more than enough memory for even some of the most tasking programs.  Hope this helps
563328
Agreed..... check out the crucial web site and find out exactly what kind of RAM your computer will support.  But even if it says you can use the two sticks you already have, you could have some other compatibility issues.\n\nThe 512MB may be 333MHz instead of 266Mhz like the 256 stick.  Even if you could run them together, the different frequencies could be a problem.  Your computer might run at the slower frequency (if, in fact, the 512 has a different frequency, is  it also backwards compatibile.  Meaning, will it actually work at a slower frequency.)\n\nThe second issue is whether or not your computer will accept two different RAMs or do they have to be the same (in pairs.)  If the computer will accept different RAMs, make sure to check if they need to be installed in any particular order.  Some computers require that the largest stick be placed in slot # 1, the next largest in slot # 2, etc.\n\nAnd finally,find out if your new computer's warranty will remain in effect if you choose to deviate from the manufacturer's specs.  Nothing worse than spending big bucks on a computer, violating specs, needing repairs, and spending more on the repairs than you did on the whole computer because you trashed your warranty trying to save a few bucks.
98348
Firstly its nor rdd2 but ddr2 ram its a next generation ram which is 33% more fast than normal ddr ram and can handle more processes at a time.....\n\nIts not different than any other ram but its just an upgrade over the other\n\nTo know more abt it just visit the following link\n\nhttp://en.wikipedia.org/wiki/DDR_RAM
340196
Yes. DDR 2100 equals to DDR266. Its not DDR2100, but PC2100. 2100 is the thoroughput/bandwidth, 2100MB/second, and 266 is the speed (266 MHz effective, 133MHz X2 because its DDR (Double Data Rate)). So its PC2100 and DDR266. Don't mix them up.\nDDR333 is PC2700, and DDR400 is PC3200.
426262
DDR2 has a faster data rate, faster bus frequency, it uses less voltage, it's prefetch size is 4 bits instead of 2bits that regular DDR has. It's all around faster.
550008
DDR2 DIMMs are not backwards compatible with DDR DIMMs. The notch on DDR2 DIMMs is in a different position than DDR DIMMs, and the pin density is slightly higher than DDR DIMMs. DDR2 is a 240-pin module, DDR is a 184-pin module.
327133
It Doesnt Matter The Ram Speed In Each Slot\nBut The Ram Chipsets Must Be The Same\nIf Its A 4chip Ram Both Might Be\nAnd if Its 8 Chip Then Both Must Be\nThe Probelm With Intel Celeron Is Its Cachmemmory\nU Can Get Over That Problem By Increasing Ram\nThe Best Brands U Can Buy Is "Kingstone,Spectec"\nU Can Buy Any Hardware From Ebay.com\nand Dont Hear Anymore Answers
394168
the RAM is identical...1 DIMM allows for easier upgrade in the future because it only takes up 1 slot...2 DIMM's take up both\n\n2 GB in 1 DIMM is 1, 2 GB stick of RAM\n2 GB in 2 DIMMS is 2, 1 GB sticks of RAM
97053
I wouldn't install them together.  I would check the motherboard specifications and see which one is right for the motherboard.  It is never good to install to differnet speeds.  Also, RDRAM has to be installed in pairs, meaning you have to install 2 chips together of the same speed.
344222
Getting more RAM essentially means that the PC can do more tasks at once so in theory it should go faster, however, unless you're doing power intensive work such as video editing, you probably wont notice a huge difference as 512 is usually fine for most everyday tasks.\nIt will also depend on the rest of your machine, if you've got a slow processor, and a small/full hard disk, then the increase in performance wouldn't be that noticeable anyway.
530187
Make sure that the memory chips are the same memory. DDR ram should be matched with DDR ram chips and not with SDram chips and vise versa. Your MB accepts both kinds of memory, so just make sure that both chips match. Some older operating systems also will not see more than 1gb of memory either.
481881
Matched pairs are important for dual-channel DDR memory.  If your motherboard does not support dual-channel, just buy another stick of the brand that's in it.
36462
I've always felt like there's no such thing as too much RAM, but I thought I'd check with the experts to see what they say. I went to my old reliable "Tom's Hardware Review."\n\nSurprise! From testing reported in December, 2005, it comes down to "how do you use your machine and what do you want to do."\n\nFor single applications run one at a time, there's apparently very little difference between 512 meg of RAM and 2 gigabytes! They suggest it's not cost effective if this is your style and the money would be better placed into a video card.\n\nThe story's different for multitasking, though, something that I do frequently. It's not unusual for me to have four or five video/audio editing and assembly applications going at the same time, along with a browser and notepad and maybe even burning and downloading at the same time. It looks like more RAM would be beneficial for me.\n\nHere's the link to the specific page I used for my conclusion. (1)\nYou can use just this summary to make your decision, or you can read the whole article.\n\nHappy computing!
15700
Your new RAM must be DDR2...Besides, nothing else will fit as DDR2 has 240 pins, DDR has 184 pins and older SDRAM has 168 pins (for desktops anyway...laptops have a different number of pins than desktops, but each type still carries a separate number of pins from the other types).  Use the recommended speed as Dell computers are built only to handle a certain speed and, generally, are not upgradeable much less downgradeable.  Using memory of a different speed can cause your computer not to boot up and could possibly cause damage to the memory and/or motherboard.  Placing them in pairs is not absolutely necessary nor is using identical memory size chips, however, if you do use 2 sticks of identical memory, it gives the added benefit of using Dual-Channel which significantly enhances the performance of your memory and processor and, thus, your whole system.
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.