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Dear! If its RAM is not fixed and it has facility to replace the RAM, you can extend it but if the RAM is fixed on motherboard you can not extend it. There are two types of RAMs:
(i) DDR1(ii) DDR2
1GB DDR1 costs upto $30 and 1GB DDR2 costs upto $20, there may a chance of $3-$4 in prices.
Now you choose that which type of RAM your laptop has?
What type of RAM is your Pc using? SDR, DDR1 or DDR2? 1 GB single module of RAM maight be heavier for your notepad and the Laptop maight even fail to boot. Just use the 2 Modules of Ram (2 chips each 512MB) and check in BIOS if the RAM capacity has acually changed.
Most laptops have 2 memory slots, if you have 1 Gb of RAM using two 512 Mb RAM then you need to replace them with two 1 Gb RAM modules. If you have one RAM module 1 Gb then you only need to add another 1 Gb RAM module. Try to use the same make and speed RAM.
You have to buy DDR2. The compatible memory is DDR2-533 PC2-4200, 200p SODIMM, 1.8v
To install the memory, follow these steps:
Turn off the system; then disconnect the ac adapter and all cables from the system.
Close the system display, and turn it over.
Remove the battery.
Loosen the screw on the memory slot cover; then remove the cover.
If the SO-DIMM is already in the memory slot, remove it to make roomfor the new one by pressing out on the latches on both edges of thesocket at the same time. Be sure to save it for future use.
Find the notch on the side of the SO-DIMM. Note: To avoid damaging the SO-DIMM, do not touch its contact edge.
Withthe notched end of the SO-DIMM toward the right side of the socket,insert the SO-DIMM into the socket at an angle of about 20 degrees (1);then press it firmly (2).
Pivot the SO-DIMM downward until it snaps into place.
Make sure that the card is firmly fixed in the slot and does not move easily.
Replace the memory slot cover by aligning the back side of the cover first and then tightening the screw. Note:When you have added or upgraded a memory card, do not use your systemuntil you have closed the cover. Never use the system with the coveropen.
Put the battery back in place, turn the system over again, and reconnect the cables.
To make sure that the SO-DIMM is installed correctly, do as follows:
Turn the system on.
Whilethe "To interrupt normal startup, press the blue Access IBM button"message is displayed at the lower-left of the screen, press Access IBMbutton.
Select Start setup utility.
The BIOS Setup Utility screen appears. The "Installed memory" item shows the total amount of memory installed in your system.
For example, if your system has 256 MB of memory and you install a256-MB SO-DIMM in it, the quantity shown in "Installed memory" shouldbe 512 MB.
The compatible memory can be purchased here online.
The maximum RAM for this laptop can up to 1 GB DDR1 266MHz RAM and 2 memory slot available, so since u have already 756 MB RAM in your laptop, that mean 1 of your RAM stick is 512MB and another 1 is 256MB, so if u need to upgrade, u have to replace the 256MB with 512MB to make it 1GB maximum.