Never done this before so looking to see what I would gain from it honestly. Been researching and just seeing better fps which I would like. So planning to get another monitor as why I am considering this but I know first I need to upgrade to a higher power supply which I have already got and just need to install. New power supply is Corsair RM850 850 Watt ATX Modular Power Supply. Now looking at just going with 2 GTX 770 as my options and what else do I need to consider for this upgrade.