Asus Gtx 960 Strix: 2GB or 4GB?

SsRicardoPT

Reputable
Dec 8, 2015
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PC Specs:
CPU I5-4460
MB Asus H97M-Plus
Graphics card GTX 960 Asus Strix
Windows 8.1
1TB HDD
Nox Nx200
XFX TS Series 550W 80 PLUS BRONZE
RAM 8GB DDR3 Gskill Ripjaws X CL9 1600 (2x4)

About the Gtx 960, should I get a 2GB one or a 4GB one? Is it worth buying the 4GB?
Or will I be fine with the 2GB??