does DDRs ram have to be installed in pairs?
150658
no...ddr means double data rate, it's one stick that works twice as fast.  this site might help. http://www.ddr-memory.com/about_ddr.asp
853916
You can't mix and match memory, if your motherboard is setup for pc2700 then thats what you have to use, if its capable of reading 3200 then you'll have to replace all the ram (if you have 2 sticks you'll have to replace both)\nThe increase in speed from 2700 to 3200 is only 73mhz so unless you are going to double the existing memory (1gb to 2gb) you aren't gonna notice much if any difference.
642874
Inserting a RAM board simply to find out its size is can be a bad idea.  Only do this if you know what you are doing & if the RAM board is the right frequency.  For example, putting a PC3200 RAM board in a computer running PC2100 can be problematic (even more sore using DDR2 instead of DDR).\n\nIf you're a pro at this kind of stuff, you can install the RAM and run BIOS setup.  From there, you should be able to tell the size and frequency of the RAM.    \n\nThe RAM board should be labeled somewhere using a small sticker.  If it is not, I would suggest taking it to your local computer store (PC Club or a small owner-operator place as they will charge you less).  \n\nIf your RAM board has a legible brand and model or serial number written on it, you may be able to google the serial number or look on the manufacturers website.
902972
Simply stated, dual-channel memory architecture splits the available RAM into two data channels, resulting in a bandwidth, or data-transfer rate, that's double that of a single-channel system.\n\nDual-channel mode requires that you install identical or "matched" RAM modules. Matched modules have the same physical number of chips in the same physical configuration. Physically dissimilar modules, even of the same capacity, may not work as well. You also need to insert the modules in specific slots. If you have four slots, for instance, you'll need to insert the matched modules in the first and third or second and fourth slots.\nIf you want to double-check whether your memory configuration is indeed running in dual-channel mode, Memtest86+ ("http://www.memtest.org/#downiso") reports this information.
609580
The straight forward answer is you may be able to use two different sizes of DIMMs (256MB, 512MB or 1GB), but you can't mix different types or speeds of DIMMS (such as 266MHz, 333MHz, or DDR-2100, DDR-2700, etc.).  You will need to always match the memory type or speed in "MHz" for them to work.\n\nSome motherboards require you to install two identical RAM modules at a time.  The best thing to do is ask a RAM distributor online such as www.buymemory.com.  They will tell you exactly what RAM type you need and can save you quite a bit on memory versus any retail store.
73024
The GamePC website has this to say.\nhttp://www.gamepc.com/labs/view_content.asp?id=noconaopteron&page=4&cookie%5Ftest=1\n\n"For those who are wondering, DDR-2 slots are not backwards compatible with DDR."
41149
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.
984607
Speed and type of RAM used is dependent on the chipset used to make the mainboard. \n\nIn your case, the answer is "no way". DDR2 didn't exist back then except in a lab.
261627
It really depends, if you have a "dual channel" motherboard.\nCheck your product manuals, or visit the Motherboard Mfg. website.\nI own 2 PC's that have "dual channel"and Hyper threading technology( 1 is a Gigabyte Motherboard - has 6 ram slots) supports up to 4GB's RAM - however it is picky on placement of single sided (chips) and double sided. Also, the amount of chips on each stick (e.g. 8 chips vs. 9 chips) The other is an ASUS I have no problem mixing - however, I lose out on the DCTechnology. I also have 2 PC's that do not have the "dual channel" and even on those I have had some issues.
888186
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.
110059
It'll take a lotta time to describe the whole process, so i've listed a couple of links here. Visit those links n read 'em.\nhttp://www.pcworld.com/howto/article/0,aid,18024,00.asp\nhttp://www.ehow.com/how_895_install-ram.html\nhttp://www.pcmech.com/show/memory/87/
1112419
Do not confuse the term DDR or DDR2 with DUAL CHANNEL.\nThe 2 are unrelated.\nIt's not the RAM which is dual channel...dual channel is a mode the motherboard operates in to increase ram speed.\nA dual channel "kit" of ram simply ensures that the 2 sticks of ram in the kit have been tested to be of identical speed so as to guarantee proper operation on a dual channel mode board.\nGenerally, any 2 sticks of ram of the same size and speed should run in dual channel mode, but because ram speeds can differ slightly between say 2 different batches or "runs" of say PC3200, occasionally you may run into timing issues with modules that were not specifically matched to each other.
324182
Yes, they work together fine.  My parents have a Gateway Performance 750 and when upgrading I could not find a PC100 stick of RAM anywhere for some reason.  I used PC133 and it works fine.  For the best performance you should use matching RAM (though I don't think it will really matter if you have to use 100MHz or 133MHz RAM - still slow).  This is to make sure that there is no bottleneck within the memory pathways and that the timings are identical.
249973
Yes I have a Sempron Sad to say and you can Mismatch any type of PC3200 DDR 400 in a sempron all you have to do is add it in a available memory bank and if one is not available you will have to take a old one out and replace with a higher capacity one.
83880
If you have the mother board on an intel chipset then it will take a percentage of ram by itself.\nYou cannot change that Neither is it required
90455
There is absolutely nothing to worry about installing the RAM on your own. \nYou have to keep certain things in mind. \nThe first one being, you have to find the most suitable ram for your motherboard. The memory specifications for your mother board would've come with its manual. \nMotherboards have a limit of how much ram it can take. So verify that before you install RAM.\nThen, balance the load on the dimms. like 2x of 256MB sticks to make 512. OR only 1 stick of 512. Although it really does not matter to balance, its just a good practice. \n\nVisit this link for further details. \nhttp://www.ehow.com/how_895_install-ram.html
461621
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.