wot is the difference btwn ddram and sdram? also how much more effective is ddr2 than ddr?
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.
956799
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
396188
easy...\n\ngo to kingston.com and use their ram wizard...  No guess work.\n\nAnoosh's suggestion just uses the system info in the registry.  It can be inaccurate.
112921
2 GB is the amount of RAM, which is alot.\n\nPC4200 I'm not sure about.\n\nDDR2 is the type or format of the memory card.
28715
don't do it. slows stuff down. RAM is cheap. if you use multiple sticks, match by size, speed and manufacturer.
430914
Nope, it is not, it runs in parallel, for instance  333 DDR DC runs at 133 MHZ through two channels, for a total of 266 MHZ.  It is over clocked to output 333....\nKeep this in mind:\nWhat are some of the benefits of using paired memory? Since the memory sticks are packaged together after they have been tested together makes sure the modules that the end-user receives will be stable and perform well. Mixing different memory could lead to system instabilities or the memory modules might not run together due to compatibility issues. This takes the guesswork out of choosing memory for a dual channel motherboard. In addition, we feel that since memory speeds are not getting much faster, this give memory manufacturers another stepping-stone before moving to faster memory. Recently many other manufacturers have also started producing these paired memory kits.
828097
Dual Channel DDR2 Shared Memory\n\nDDR2 is a new memory architecture that enables systems to improve performance and reduce power consumption. The amount of RAM you have determines how many programs can be executed at one time and how much data can be readily available to a program. It also determines how quickly your applications perform and how many applications you can easily toggle between at one time. Simply put, the more RAM you have, the more programs you can run smoothly and simultaneously.\nAvailable DIMM Slots:\nTwo Memory slots offering up to 2GB\nMemory Bandwidth:\n533MHz - 8.5 GB/s with dual channel - Improves performance\n \nPerformance Professional User:\n2GB or more for Intensive simultaneous business applications with headroom for future OS/Applications\nMainstream User:\n1GB or more is recommended for business users running multiple simultaneous office applications
1141502
No, DDRam and SDRam are two different and uncompatible types of Ram.  If your new motherboard takes DDR and you only have SDR, you will have to go out and purchase DDR.  Sorry.
479311
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.
1113637
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
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
445965
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.
237353
The cl2.5 might be faster but I would argue that nobody could tell the difference in when playing the game if you had to like systems with one using 2.5 and the otehr using cl3. The guys that make these comments use testing tools to give them framerates and such which can show the difference, the user can't see that little of a difference.\n\nAs always more ram is better on XP however 1GB or 2GB in most games is not going to make much difference either. I said most games, some will use just about all the memory you can throw at it.
909878
dont use ur old stuff unless its ddr2 ... if its older than 6 months it isnt ... dont mix the types or you'll slow everything down , just add another 512 if you have a SINGLE stick, and check out the site the guy above mentioned to get the same speed memory ... if you have two sticks of mem now they are 256 each and most likely in dual channel configuration ... in that case i would get the same speed memory but buy (2) 512s' or (2)1gig sticks ... if you break up a pair of sticks in dual channel or add a third you will slow things down also ...
1165662
Poor RAM\nRAM is directly related to the workrate of the CPU, more RAM would definetely take the load of the CPU.\nGood luck...
65190
Do you mean DDR2 and DDR ?  GDDR2 are specifically for graphics cards.  DDR2 are 240 pins and DDR are 184 pins  so you will not be able to use these.\n\nBattery Wizard
838655
DDR=double data rate ... ddr2 is the latest memory ...its the fastest with the most bandwidth .. the motherboard must support it to use it.