Help with choosing my PSU

[PS3C4D]

Hey there
I'm looking for a PSU for my build and I'm just panicking over this because I fear that I get some psu that doesn't work with other hardware in my build so here are my questions:

How much power do I need? I've used online websites but each of them give different results so that leads me to ask someone who can manually see how much I need.
Here are my system specs:
Mobo: Gigabyte Designare-EX
Cpu: Intel i7 5820k
Ram: 32gb DDR4 2400mhz
Gpu: 3x Asus strix 1070 (OC)
( https://www.asus.com/us/Graphics-Cards/ROG-STRIX-GTX1070-O8G-GAMING/specifications/ )

3 HDDs and 1 SSD
Case: NZXT Phantom 630

I had chosen the Evga supernova 750w g2 , but I figured maybe I'll be overclocking the cpu in the future so I ran the tests again and came up with the supernova 1000w g3 , but like I said, I'm not sure if this is the right one and I don't want to get something that's over my needs because I have a limited budget now.

And my other question is that do these PSUs work fully with haswell cpus? Wouldn't there be any problems or anything?

 

[Isokolon]

With 3 GPUs you'll need a 1000W PSU.
750W is recommended for 2 GPUs.

Any of those GPUs can draw up to 165W, the CPU draws up to 140. This is before OCs. Add 50-80W for the board and 30W for the RAM, you'll be drawing around 750W under full load.
This is before any OC is applied.

Haven't seen any reviews about the G3 yet so I won't recommend it. Might be a great PSU, might be mediocre haven't done the research yet

I'd take a look at the new Corsair RM1000i, EVGAs P2 or the XFX Pro 1250W

I've heard some trustworthy complaints about Seasonic's X-series so I won't recommend it.

BeQuiet's Dark Power Pro, Corsair's HXi, Seasonic's & Super Flower's Titanium PSUs are very good as well but usually higher priced and probably a bit overkill.

 

[PS3C4D]

Thanks,
I'll choose the 1000w but I just wanted to ask that, since these gpus are factory overclocked, doesn't that mean that they need more power already before any ocing by me?

And do you by any chance have info about compatibility with haswell cpus?

 

[Isokolon]

I went after Asus own specification for the Strix OC
A regular 1070 needs around 140W, the Strix OC 165W.
But due to boost 3.0 and the Pascal architecture the only reasonable OCs are oc the memory.

What do you mean with Haswell compatibility?
Any PSU that supplies enough power is compatible with Haswell CPUs
Most high-end PSUs are also compatible with the deep sleep low power modes introduced with Haswell (c6/c7).
All of the PSUs listed are fully compatible with all the features by Haswell

 

[PS3C4D]

I went after Asus own specification for the Strix OC
A regular 1070 needs around 140W, the Strix OC 165W.
But due to boost 3.0 and the Pascal architecture the only reasonable OCs are oc the memory.

What do you mean with Haswell compatibility?
Any PSU that supplies enough power is compatible with Haswell CPUs
Most high-end PSUs are also compatible with the deep sleep low power modes introduced with Haswell (c6/c7).
All of the PSUs listed are fully compatible with all the features by Haswell

Yeah I think I got my answer. Just wanted to know if G3 or G2 support the deep sleep low power mode.
Thanks for your replies.

 

[Isokolon]

looked at reviews, G3 looks really really good mate

 

[PS3C4D]

looked at reviews, G3 looks really really good mate

Yeah it does! Though unfortunately I'm not able to get one.. EVGA PSUs ( or any other of their products really ) are not sold in my country and I had to ask someone to buy it for me from Canada, and he said he only found the 1000w G2, which isn't really bad either. The G3 seems to be the optimized version of the G2. So I'm getting the Supernova 1000w G2