I would like to occasionally upgrade it cheaply if possible..
I seem to be using most of my RAM a lot of the time.
At the moment I have 6 RAM slots, 4 are similar sized and 2 are larger, the 4 have a 1GB stick in each (2 pairs of 2 different manufactures / DDR2 but don't know how many pins).
Would it be worth / is it possible - to buy one larger capacity stick with faster access, or should I try to fill up the empty larger sockets? or just buy 4 new RAMS with twice the capacity, and more speed - seem to be quite expensive.
(I don't know why only 3GB of RAM is available, I removed all 4 of them this week for a different reason, so maybe one isn't seated correctly)
I realise the speed of the machine is also affected by HD access, Processor etc - as you can tell I am a bit lacking in knowledge
thanks in advance for any pointers, including 'get a job and buy a decent machine!)

John