SeaSonic will be releasing  a new PSU that is totally white under model Snow Silent 1050W This baby is 80Plus Platinum certified and comes with one big single +12V rail, it has a 120mm fan and is ful... SeaSonic To Release an all-white Snow Silent 1050W PSU
I prefer a single line design. There's no messing with deciding where to connect which cable, and if you buy a quality PSU, it'll have no issues with voltage regulation. Theoretically with separation it's more stable, but well... When I was loading Corsair AX1200i even with spikes up to 110A on 12v line, it maintained voltages at really stable levels.
it's an Amperage question multiple 25A and 2 590GTX ( huge A eater) and you might have trouble with your 1200W PSU but single 150A and it goes fine with your 800W PSU. both side have for and con point, but for normal/gaming/OC single is more effective.
Thanks guys. I actually thought it's better to have two rails for two graphics cards... only half the story
i always prefer a single 12V rail, its simpler to connect all the devices. i think is better one big circuit than many small circuits. this topic aside, this PS its just beautiful.
It really depends on how the PSU is designed. I always liked the explanation found here: Single vs. Multiple +12V rails: The splitting of the +12V rail
its a perfect match for those white asus x99 motherboards. White NZXT H440 tower + asus x99 deluxe motherboard + seasonic snow white psu. Add 1 or 2 white ssd's to put on display where the h440 has 2 spots right in front of the window. A gpu with white accents. Would be a sexy lookin build.