Correct type right? I don't understand where you said I will need two.
You should only use the 3-way. Nasty is saying you can hook it up using two 2-Way cables but I don't think that's how it works.
Also I am running my PC off a power bar that runs my TV, PS3, 360, Wii U, lamp and my old laptop. Will that be fine? Curious as I will probably be using another 500W with both these cards.
The outlet I am using with the power bar I recently had routed to its own circuit breaker so theres I think 2800W dedicated to that one wall outlet.
As long as you're not running them all at the same time, you should be fine. Also I'm willing to wager your system isn't going to use up any more than 600W if you're playing a game.
BTW, what exactly is Micro stuttering?
Layman's explanation: The perception of slower frame rates than what is reported by FPS monitoring tools such as FRAPS.
Technical explanation: Microstuttering is an issue between cards to synchronize when to spit out a frame to the display properly. This can't be fixed with frame rate and refresh rate tweaks like triple buffering or vsync. Both SLI and Crossfire default their render modes to alternate frame rendering (where each card renders a frame in succession) because it's a universal solution. In any case, since the setup has to show frames as they were rendered (i.e., in a 3-way case, you're going to get frames from cards 1, 2, and 3, no matter what), whenever that card is done, it's displayed on the screen.
The problem lies in that frames aren't always rendered in the same amount of time and that you can't predict the future (i.e., cards can't 'pre-render'). As a scenario, say card 1 renders a frame at 20ms. 5ms later, card two is done and spits the frame out. Then 20ms later, card one spits out another frame. Then card two spits out a frame 5ms later.
So while in essence, both cards are running at 50FPS (both are spitting a frame out in 20ms intervals), in realty, you perceive this as a lower FPS, probably around 40FPS since the human brain can't process a events 5ms apart so the two frames appear as one. Essentially, you have a mixture of very fast frame rates with very slow. And because FPS monitoring tools does an an average, it won't catch this variance.
Or you can watch this video: