hello guys , i'm in dilema which gpu to buy in my country where i live , hardware isnt cheap at all , but i see dramatic difference in prices betwen this two models , 8gb is arpox . 375 $ , 4 gb is 289 $ , so is 8gb model worth of extra almost 100 $ ? and do i need 8gb version because i' play games on 1920 x 1080 resolution so , will i have situation in future to need more Vram for future games ?