Even used RAM lasts a long time.
It will be hard to find new DDR RAM. So I think you should buy that 2nd hand ram.
Just make sure that the golden pins don't have many scratches on it.
BTW When I bought SDR RAM 2nd hand the shopkeeper gave me 1 year warranty.
See if you can get any warranty or not.
Thanks, i'll remember the guarantee part.
Could you tell about any other potential problems/defects in 2nd hand rams?