Give this a try...
 
http://www.extreme.outervision.com/psucalculatorlite.jsp
 
 
 

Even 750W is powerful enough for your RIG. 970 has TPD 145W. I have single 970 with i5 [link=mailto:3.4@4.5]3.4@4.5[/link], Maximus VII Hero, 128GB SSD + 3TB HDD and my system consumes max. 300W so I still have 450W headroom :) Your system will consume max. 500W so you would be pretty fine even with 750W G2.... And all further components will come with lower power consumption so you don't need to be worried about this.
 
BTW, I was really surprised when I found out that 1000W G2 does not have eco switch ! So watch out of these, then the better choice is Corsair 1000 HXi but with that transformer buzzing sound :-/

It's definitely enough and it's ready for the future. There is a big pressure to make low energy consumption components nowadays so I'm pretty sure we won't see such power hungry GPUs than Radeons. If AMD wants to compete with NVIDIA they must show something much stronger than GTX980/GTX970 and with significantly lower power consumption than actual R9 series. > 1000W supplies are worth only for people running 3-SLI or more. People should also realized how much their system consume during load. Because if they have a big overkill efficiency goes down. The highest efficiency is around 40% of load so with 750W PSU the sweetspot is around 300W. With 850W it is 340W. My PC is most of the time idle and consumes only 65W so the efficiency is pretty low around 85%. Ideally is 92% at 300W. But I agree this is not a big difference :) The most important thing for me is that the PSU fan is OFF when iddle :)

No there won't be such GPUs. Nobody will buy a GPU with high power consumption nowadays. Look at AMD R9 series, everybody complain about a power consumption which can supply an African village for a month :) Trend is to make components with lower consumption than previous series. Years ago you needed a house to accommodate a computer with astronomic power consumption. Now technology process tends to be smaller and smaller and the lower the process is the better power consumption and efficiency you have. This is a fact. Also you should realize that 1600W PSU is much more expensive than 850W. And efficiency in 20 - 100W is as low as 76W. If he does not plan to go more than 2SLI, he is pretty good with 850W for now and for the future ;) Everything more than 1000W is overkill... 
 
Btw, 4790K overclocked pulls less than 20W more than on stock. Max. power consumption of the system without GPU is 150W, let's say he has 2x 250W cards (what is insane imo nowadays) cards so he has still 200W overhead... Those wattage recommendations from manufacturers are ridiculous. I would not be afraid of PSU noise, because those GPUs together will be much louder than PSU fan if active.

These are all rumors for now. Titans are pretty power hungry but it is not a mainstream card and it's still 50W less than 290X. Btw, it's possible, look at GTX980 and R9 290x - GTX980 has 165W TPD and R9 290x - 290W. This is an extremely ridiculous difference because GTX90 is much powerful than AMD's flagship card... So it's not about power you know. AMD needs to optimize this parameter, otherwise they will never win over nVidia. If nVidia wants they will release a GPU with 300W for price of R9 290X and blow AMD out of the water...
 
And yes, it's not a mistake to take even 2KW PSU, it's always about money, isn't it ? :) For example, here 750W costs 119Eur and 850W costs 144 Eur. So 100W difference is not worth for me. I took 750W because I'm sure I won't need stronger PSU in the future. But never say never, right ? :)

Yep, it's crazy. But you are a bit wrong here, it's not close to Titan at all. 290X performs similar to GTX970 (in most cases 970 is even better) and it consumes ridiculously 2x more power and it's more expensive :) 145W vs. 290W. 980 is far better than 290X. For crossfire it's disaster to have 2x 290X cards. It is like to have 4x GTX970 :) And guess which one would perform better.   
 
Also can't get why anybody would buy AMD CPU instead of Intel. Only if they would save but AMD has nothing to compare to Intel. I had AMD long time ago, then switched to Intel and never came back. And as you said AMD CPU with AMD GPU... well your electricity supplier will thank you :)
 
I'm bit angry on nVidia at the moment because they've lied about 970 specs but I will stick with that card because AMD does not have anything better to compete and it's still a great card despite of it's memory configuration... Let's wait for R9 3xx series but I'm skeptic here. Even they introduce something great, I'm sure nVidia has another ace in their sleeve :) As usual they will blow AMD out of the water :)

Nice, what version do you have ? I have SC but have pretty high temp, on stock 77c. But I don't care so much about temps :) It's a beast anyway for that money. Could be a bit stronger because I play on 75Hz and sometimes it is problem to maintain 75fps :)

wheelsdeal
Unfortunately i didnt go with EVGA.There wasnt any stock in my area so i ordered it from a shop like 10 days ago.Went today to see whats going on with the order and they didnt had a date when they will have the card while an MSI and Gigabyte 970 was standing right in front of me on the bench so i caved and got the MSI Gaming version.Dont know the differences first time i get an MSI product.Always used EVGA on nvidia and Sapphire on AMD.

Hmm...  That was exactly on what I was planning on this time was a full-out MSI build in both the Gaming 7 mobo, and a GTX970 from them as well (for uniformity and coordination, and maximum compatibility).  Now whether I'd consider the 750W over the 850W (as I probably won't plan to SLI, at least not right away), that's another thing...  I saw Newegg at least once offer the 850W for a little cheaper than the 750W, and I should have pulled the trigger right there and then.  Now I'm feeling rather dumb about it.  Oh well, I'm sure Newegg will be having March Madness sales.