PC Requirements for WoW Multiboxing

[Krilog]

I am thinking of getting this
https://gyazo.com/cbc1c60739b947c6f515e1a9fc79cd64
And this is worth 1400 US Dollars in my local store. Realistically how much WoWs could i run for gold-farming on lowest setting. And i said around 950$ US Dollars because I know in my country the parts will always come 40% more expensive than original price.