Well the build you mention is actually an older one now and not best bang for buck for sure, have you already ordered?
Maybe a post in the pilots lounge for the latest and greatest and the best budget builds would be the best shot, for video card a 9xx series would be best in my humble opinion, ideally at least a 970 which ain't all that expensive for the performance you can get out of one.
With regards MP nothing system wise you would need to do, I would suggest concentrating on getting yourself up and running with the new rig prior to the MP investigation.
thanks,
Lewis
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