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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?
yes just pur chase 1 128 MB or 512 MB or 256 MB ram but check first *********** bord ram module check your old 64 Mb ram if it has 1 notch it is ddr1 or ddr2 if it has 2 notch it iks sdram then pur chase from shop. then fix it on secodn slot
i) LOW DENSITY modules have 100% compatiility with ALL systems and ALL chipsets. HIGH DENSITY modules only have 10% compatibility
here compatablity means LOW DENSITY RAM are accepted by all system(100%) or any make system.. HIGH DENSITY RAM are accepted by 10% by only some system or computers...
ii) in order to check system performance or amount of Computer RAM usage press the ctrl+alt+del simultaneously a new window(window task manager) will appear showing:
CPU usage: showing the amount of CPU or processor utilized at that particular time. PF usage: showing the amount of RAM memory utilized at that particular time. Physical Memory: showing Total RAM Memory, Available Ram memory....
iii) baiscally they are two types of RAM they are:
DDR1:which is older one supported by older system or older mother boards which is costlier DDR2: which is latest one supported by all new system or new mother boards which is less costlier
DDR: double data rated ram......which will send data at a double rate compared to SD RAM
iii) here color doesnt matter, these slots either support DDR1 or DDR2 but not both at a time
DDR1 has 184 pins or gold plated pinssss... on the edge of the RAM DDR2 has 240 pins
so difference doesnot allow DDR2 to placed in DDR1 motherboards or vice versa...
iv) it does have anything to do with no of chips on the RAM but they only differ whether it is DDR1 OR DDR 2(DDR2 are much faster than DDR1)
NOTE: whatever may the the RAM, each RAM has FSB(called Frequency...) which determines the frequency of rate at which data is tranferred from RAM to processor(CPU) usually in MHZ such as FSB 300, 400, 200 , 333...................
more the FSB the faster data is transferred to the processor(CPU)
dont worry even RAM with less FSB's work well with the processor....having 1 GB RAM or 2 GB RAM is engouh, it only matters with the speed of CPU ... but not RAM......