What is the purpose of SRAM and DDR2 memory in a laptop? On what basis their configuration has to be selected?
343223
SDRAM is an older type of memory and means Single Data Rate Ram (access is only on 1 edge of a cycle). No more used in new PCs (only until P3).\nDDR(2) is the current type of memory and means Double Data Rate Ram (access is on both edges of a cycle).\nThe purpose of the memory is to store the application program (read from the hard disk) from where it will be executed by the CPU. You have to select that type of memory the manufacturer suggest. Only the amount is your decision, best bet for a laptop nowadays is 2 x 512MB.
849380
Sorry,the answer is no.DDR has 184 pins and DDR2 has 240.Unless your motherboard has slots that accept both then the answer is yes.
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.
957829
You might be better off going to Crucial.com or one of the other good memory sites and letting them test your machine.  They can tell you exactly which configuration will and won't work on your motherboard.  It's possible to save a lot of money by getting an expert's advice on that.
525940
RAM is temporary memory - but using your max amount is going to make your computer run funny.
92095
I think due to in-sufficient Memory Room i.e. RAM [Random Access Memory] your should add sufficient Memory Bank in your PC.
5436
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...
540696
You need to leave more information.  What computer do you have, what motherboard....\n\nHow many slots in total do you have?\n\nIf you have 4 slots, then the chances are you need to insert 2 RAM modules at the same time.  Not a definite, as will need more info on your computer,  but thats probably likely. You could buy 2 sticks on 1GB, and insert them into the currently filled slots, and put the 2 512Mb in the other slots (if you have 4 slots)  That way you will have 3Gb RAM, should run quite will with that!!!
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
401908
2 x 184-pin DDR DIMM sockets\n\nSupport up to maximum 2 GB memory (PC manufacturer's maximum memory may differ)\n\nSupports unbuffered PC2700/2100 non-ECC DDR SDRAM memory
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.
70182
Some of these answers are wrong and others are not clear enough.\n\nYou need to first check with either the PC maker or motherboard manufacturer and see:\n\n1. What is the total amount of memory supported by the board?\n2. Does this memory have to be installed in pairs?\n3. What type of memory am I currenty running so I don't break Double DDR by installing a single DIMM\n\nBasically your usually better off with multiple chips rather than a single large chip. Your cost per MB is usually lower this way plus if the system is designed to use multiple channels you get added bandwidth by splitting the memory into seperate banks on seperate busses.\n\nCrucial has a pretty good web site for finding out what memory your system can take but don't take that for gospel.
520485
Run the Crucial Memory Advisor - http://www.crucial.com/promo/index.asp?prog=desktop2
201822
as an example if u have p3 the internal speed of the ram is 133 Mhz , and for P4 is 400 Mhz or 800 , that means all parts shall be compatible to each other in order to get best performance , also memory will go in double capacity , 128, 256,512,1028 , u cant add 128+512=640 its not really wrong but how money can the add memory worthy
74898
That depends on two factors.  One, you have to know how the memory modules are populated on that notebook, do you have two 256MB modules that you can replace.  Do you have one 512MB module and no extra slots.  Or do you have the kind that has 256MB integrated into the motherboard and only one module that can be replaced.  Two, it depends on what kind of memory you need for it, I mean yes, you need a SODIMM but what speed, some type of DDR or is it DDR2.\n\nThe only thing I can reccomend based on your question is for you to head over to the Crucial Memory Advisor, http://www.crucial.com/store/listmfgr.asp?cat=RAM and either run the scanner or enter your manufacturer and model number to find the ram appropiate for you.\n\nOnce you know what you need, find the best prices on the ram at Newegg, http://www.newegg.com/
970440
The memory probably is not going to work on your Compaq.  The best way to find out is to take a trip over to http://www.18004memory.com and see what your laptop requires, and see if the other is compatible.  They will tell you if the system can handle more, and what types are needed.  Not all RAM is created equal.  Some is non-parity, ECC, etc.  There are many different types, and compaq can be fussy.  Hope this helps.
919810
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