Which GPU?

[domajm32]

SAPPHIRE NITRO+ Radeon RX 580 DirectX 12 100411NT+4G-2L 4GB 256-Bit GDDR5 CrossFireX Support ATX Video Card w/ Backplate (UEFI), SAMSUNG MEMORY or Sapphire PULSE Radeon RX 580 8GB GDDR5 PCI-E Dual HDMI / DVI-D / Dual DP OC w/ Backplate (UEFI), 100411P8GOCL?
which one is better? What does the 4GB and 8GB GDDR5 mean, is more better and would I get the pulse because of it?

I could get the NITRO+ for about 20$ cheaper, is that a good deal? 

Mostly going to be playing wow, skyrim, dragon age. maybe some fps games. 
thanks

[crosstiger]

4GB or 8GB GDDR5 is the memory that the gpu has. 4 GB and 8 GB is the capacity. More = better. GDDR5 is the type of memory that's used. It's the same on nearly any modern card (with a few exceptions).

 

I advise you strongly to choose the RX 580 with 8 GB of memory. The gpu is strong enough to make use of the bigger memory which means that you get a better framerate in games.