RAM upgrade

hi

i was wondering if i could get some advice please?

i have an old Optiplex745 computer and it has 2GB of RAM in it

i want to put another 2GB of RAM in it

this is my fist time at this and i have a couple of questions

i have another old computer that would have DDR2 RAM that i could switch over. but is it as easy as putting it in? would it be compatible? does it just have to be DDR2? and then bingo it works?

and if it dosnet work and the computer dosent boot, would you render you...

RAM upgrade