How much memory needed

Geordie77

Commendable
Nov 2, 2016
8
0
1,510
Hi. My son has a full size tower with a Radeon RX 470gb gaming x graphics card.
For Christmas i've got him an Intel i7 8086k limited edition CPU and a MSI Intel Z270 GAMING PLUS Kaby Lake ATX Motherboard. He only plays games like World or Warcraft, The Isle etc. My Christmas budget is running low and i need to get some DDR4. On one hand i need to spend least possible but at the same time if its not going to run well but on a budget. Can anyone help / offer recommendations? I'd like to spend less than £100 if at all possible. Will i need any additional cooling devices if so what?
Thanks in advance.
 

Geordie77

Commendable
Nov 2, 2016
8
0
1,510
I'm not great with this sort of thing, seen the motherboard advertised and posted question on ebuyer listing and someone posted back and said compatible:-(