Can i mix and match memory sticks. 2 5121's + a 1 gig stick?
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!!!
862619
http://www.crucial.com/store/listmfgr.asp?cat=RAM
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.
1079450
FRIST TRY PUTTING THE 512 IN THE SYS 1ST THEN THE 256 THEN THE 128. IN OTHER WOEDS START WITH THE HIGHEST FRIST THEN WORK UR WAY DOWN
1081988
no i dont suggest you to use both the rams bcz 512 ram is 33mhz and 124 ram is 133mhz the data transfer rate is different in both the rams.  your system will be hanged frequently so. dont use both.
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
670447
no need for another 1gb ram, is that brand new one if yes go back to the store and return it and if you have an old one installed and trying to add a new one maybe your memory old and new are not compatible to each other pls  check if is the  same brand , model and frequency, any of these indefference can cause you malfunction in your pc.
917566
as long as it's DDR you'll be fine ... even if it's faster DDR like for example PC400 it will still "clock back" to the 266 that your board uses ....
923801
Do you have the original 64mb still in the computer, and you just added a 512mb card? If so, your BIOS might not recognize the additional memory; you'll have to do research to determine if this is the case.\n\nIf you swapped the cards, though, you might have a bigger problem: older computers often had limits to the amount of memory they could use, and even though sdram is now available in multi-GB amounts, your computer's bios may only allow a maximum of 64mb of it to be used.\n\nYour best bet here is to (a) make sure you've purchased compatible memory, (b) swap the cards instead of installing both (if you haven't already), and (c) check the manufacturer's site to see what the maximum memory amount recognized by the system is.
707711
You're going to have to open it up to put the new RAM inside so why not?\n\nAnyhow your computer supports DDR PC3200 or PC2700 with a max of 1GB per stick. Your computer supports 2GB ram total.
951767
go to www.crucial.com and find out
137772
Yes, you can if its of the same type,( Don't mix a DDR with a SDRAM) but there is a possibility of conflict later on .If u want to do a RAM test go here http://www.crucial.com
880108
You would have to first learn whether or not your motherboard supports the faster RAM.  http://www.crucial.com has a great tool to help you figure it out.
117518
you only need pairs if it is dual channel memory
258010
As long as the motherboard supports both ram..but its not going to improve much having the 333. It will not harm the memory.\n\nI would stick with the 1gb...if you find yourself needing more ram then you can put the 333 in but note..it will decrease the speed at which the memory operates.
470550
Go to www.crucial.com. They have an easy way to figure out what you need.
128886
Yes, these two memories have nothing to do with each other.  The DDR2 memory is controled by the motherboard and used by the OS. The memory on your vid card is controlled by the card.