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If you're not sure if a module is right for your system, use theCrucial Memory Advisor tool for a list of guaranteed compatible modules. first you will need to select the manufacturer from a drop down list then select your product line from a drop down list then select the model then click find it will take you directly to compatible ram also you will have an option to scan your system
Yes, it would be best to take the old RAM out.
I am assuming that this is 1 stick totalling 2GB. Optimally it would be good to have 2 x 1GB modules totaling 2GB, so they could work together. Otherwise, yes, just remove the the old ram and install the new module.
If you are running a 32bit operating system, 3GB is all the system can use anyway.
Hope this helps!
Could you please go online and in a search engine type "MAX RAM E-Machines (here put your model #)." Pick a link that secribes your maxi,um ram and if it's only 2GB you'll have your answer. If the max is higher there should be instructions on how to set the computer to acess and show the RAM.
Probably your Operating System is a 32bit. 32bit OS can only read up to 3GB of RAM regardless of the capacity of RAM you install. For example you installed 2pcs of 2GB RAM, that makes it 4GB in total, 32bit OS will only recognize 3GB. upgrade your OS to a 64bit OS and you can upgrade your RAM up to 8GB depending on how much your motherboard can handle.
The T40 has two ram slots, you can put a 1g chip in each totaling 2g. If the chip will remove, then it is changeable. Vista needs a minimum of 256 to run, so, when you change BOTH chips to equal 2g it will probably read 1.744g, or it may read the full 2g. If it only reads 1g, then the second slot under keyboard may have malfunctioned. It could also be that the 256 chip is bad and your really only running 512 now. With all that said, in order to achieve 2g, you will need to put a 1g chip in each slot.