Working on my first computer at the moment and have seemed to hit a wall on PSU. I have heard numbers from 650 - 1100 and at this point i'm so lost, and I have tried PSU estimate sites but would prefer a person who knows what they are talking about to give me an estimate. All of my parts don't have a supply requirement on them which is why I have decided to post and also in case anything is very wrong with my build maybe someone could point it out to me.
Case: NZXT Phantom PHAN-001BK Black Steel / Plastic Enthusiast ATX Full Tower Computer Case ( USING ALL 8 FANS )
Mobo: ASUS P8Z77-V PRO LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum.
Since the motherboard can only handle up to two NVIDIA graphics cards in 2-way SLI mode ...
For a system using two reference clocked GeForce GTX 680 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 750 Watt or greater power supply that has a combined +12 Volt continuous current rating of 53 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.
The PC Power & Cooling Silencer Mk II 950W (PPCMK2S950), with its combined +12 Volt continuous current rating of 83 Amps and with six (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with two GeForce GTX 680 in 2-way SLI mode.
In fact a PC Power & Cooling Silencer Mk II 750W (PPCMK2S750), with its combined +12 Volt continuous current rating of 62 Amps and with two 6-pin and two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with two GeForce GTX 680 in 2-way SLI mode.