I've just bought a bargain Dell Desktop PC.
It comes with 2 memory slots.
Currently it has a Dell (Samsung) 4GB ram stick (PC3 1600Mhz) in one of the slots (other slot empty).
I'd like to upgrade.
I'm not quite sure about matching in pairs.
1) Buy another 4GB matching from Dell at £41 (seems expensive) and run it with the existing one.
2) Buy a decent matched pair of new 4GB sticks to replace the current one (for £37)
3) Buy a decent 8GB single stick to replace current one (allowing me to easily upgrade later by adding another) (£39)
4) Buy a decent 8GB single stick to go with the current one (which would equal 12GB)(£39)