To give the PCI-E Slots more Power. See page 2.35 of your manual.
"Both EVGA Titans got their own power connectors." on this same page it also tells you that your PSU should be a 1000 Watts. With your two Titans and a i7 3930K I would go with the EVGA SuperNOVA 1000 G2 Power Supply or EVGA SuperNOVA 1300 G2 Power Supply On my Dark Titan the X79 Dark and two Titans I went with the 1300 G2.
"ALso this PSU doesn;t have 6pin so I would need to get adapter or something." your card came with two 2x4 Molex to 6/8 pin and most PSU's come with a combo cable of 6/8 Pin for Graphics cards.
 
Added:
Benching at 5.1GHz and Pushing Both Titans I pull 890 to 910 Watts while running 3DMark 11 or Fire Strike.
Gaming at 4.6GHz I push 760 Watts and as high as 800 Watts while in Tomb Raider.
At least that is what my APC UPS Unit is telling me.
I am on Water on the CPU and Both Titans running Two Loops.

poor and under powered? really? I mean I haven;t notice a single problem so far, both Titans are working at full speed and CPU is OCed to 4.5Ghz. I could be mistaken ofc but... also EVGA PSUs are a bit hard to find here. I had problems to get cards as well :)
But will look into that...
On the other side.. if you need 1300 for SLI what do you need for 4way SLI? I do plan to add two more of these later on, that is why I got this pwer with 4way x16 SLI possible but.. what then? :) THanks!

well I do have h100i water cooling, bunch of noctua fans, 5x120PWM and 3140PWM, plus 4x HDDs adn 2 SSD. But then again titans are at stock and didn't had a single problem, freeze or any of the symptoms that system is under powered. so I also think that guys are overpowering their systems really but... who knows :)
in case of more Titans then ofc would go for something stronger but as everything works really great so far... was mostly wondering to find purpose of that 6 pin connector on motherboard but also great to hear advice's for the rest of system as well ofc. 

which again means that 1300 is a bit overkill for 2 of them :)
will check out thanks!! there are enough connectors for 4 titans with 1300 EVGA model right? just checking as will definitely be on lookout if I can get my hands on that one.Anyone can confirm if EVGA online shop can deliver to Europe with EU standard power cables as well or if there is online shop in Europe that delivers to Bosnia? Still not part of EU so yea there can be problem for delivery :(

Thanks!
Back on subject, would you suggest finding and plugging additional 6 pin connector from PSU to MBO? 
or it is needed for 3-4 way SLI or needed at all?
 
Again everything works withouth single problem but would like to know :)
Thanks

maniacvvv

mirkoj

well I do have h100i water cooling, bunch of noctua fans, 5x120PWM and 3140PWM, plus 4x HDDs adn 2 SSD. But then again titans are at stock and didn't had a single problem, freeze or any of the symptoms that system is under powered. so I also think that guys are overpowering their systems really but... who knows :)
in case of more Titans then ofc would go for something stronger but as everything works really great so far... was mostly wondering to find purpose of that 6 pin connector on motherboard but also great to hear advice's for the rest of system as well ofc. 

When you run a lower quality PSU unit that close to its maximum rating....
--->Its efficiency goes down, voltage regulation is worse and its temps rise

Running a x79 config with SLI Titans (and everything you posted above) on a Thermaltake 875w?
I personally think that is nuts and just -asking- for trouble.

Dont be surprised if your system and videocards are unstable at high loads, and dont even THINK about overclocking anything and getting good results.

Think about what a blown PSU might do to your config and--> how expensive the parts are that it might take with it

But that also means that EVGA is advising people to do destructive behavior by saying that its OK to run 2 Titans with a 650Watt PSU.  I think the BEST thing to do it get a UPS or a KilloWatt all plug that can see how much draw there is under load to see if its in a safe range.  As a point of reference, my Setup is 90% similar + 3 monitors plugged into the UPS + a Logitech G19 and I hit 700Watts under FULL load on GTX 770s.  So he has to be around 720 if he's with one screen.   The truth is its way to hard to see until you have the raw numbers in front of you he could be OK or on the edge of blowing that PSU !

EVGA or Nvidia for that matter are not saying you need a 650 watt power supply to run two Titans. What they mean is that you need a minimum of 650 watts available from your power supply to run the cards correctly. I don't know how many times we see posts here from people who spend thousands of dollars on video cards, high end CPUs and M/Bs, 500 hard drives and fans in their system and then they cheap out on a cheap (not saying yours is cheap) and under powered power supply. The power supply is the base for your system hardware, whatever you think you might need in power from a power supply, add 25-50% to that and that is what you should be getting. Power supplies are only rated to give you a specific output at a certain operating temp. Once the power supply is put under heavy load, temp in the PS goes up and efficiency goes down. Running power supplies under heavy load for extended periods of time will wear out the power supply and cause it to fail before it should. Power supply failures can be pretty catastrophic sometimes taking out other hardware like your MB, CPU or video card with it..............

Not a bad thing to overkill the power supply on a system. It is the heart of a system. Plus when you have a bigger power supply than needed, the power supply will run cooler, last longer and gives more stable power to the system. When we spend thousands of dollars on CPU, MB, video cards, etc. a couple of hundred dollars spent on a quality more than enough power power supply is a wise investment :)

maniacvvv

mirkoj

well I do have h100i water cooling, bunch of noctua fans, 5x120PWM and 3140PWM, plus 4x HDDs adn 2 SSD. But then again titans are at stock and didn't had a single problem, freeze or any of the symptoms that system is under powered. so I also think that guys are overpowering their systems really but... who knows :)
in case of more Titans then ofc would go for something stronger but as everything works really great so far... was mostly wondering to find purpose of that 6 pin connector on motherboard but also great to hear advice's for the rest of system as well ofc. 

When you run a lower quality PSU unit that close to its maximum rating....
--->Its efficiency goes down, voltage regulation is worse and its temps rise
Its stressful and will shorten the life of your PSU --and-- can cause a catastrophic failure 

Running a x79 config with SLI Titans (and everything you posted above) on a Thermaltake 875w?
I personally think that is nuts and just -asking- for trouble.

Dont be surprised if your system and videocards are unstable at high loads, and dont even THINK about overclocking anything and getting good results. It might just go BANG with smoke and sparks   

Think about what a blown PSU might do to your config and--> how expensive the parts are that it might take with it
-------------------------------

X79 Motherboard with dual Titans in SLI
h100i water cooling, bunch of noctua fans, 5x120PWM and 3140PWM, plus 4x HDDs and 2 SSD's

Thats ALOT to risk on a $140 PSU

 
It's a decent power supply and he's unlikely to draw over 650 watts from it. A moderate concern  is with age, a PSU loses some of it's output capacity. Generally I recommend a PSU sized so that under your maximum load, you will not exceed 80% of the rated continuous output. Currently he meets that criteria.

Ever since my 580 SLI I've been using the power boost from EVGA or the 6 pin pci / 4 pin molex that appears on boards for power to the PCI slots. It's just an added measure of safety as there have been people who've melted their 24 pin connection because the slots were not getting enough power. 
 
I'm not sure how demanding 3D rendering can be but for a few bucks extra when you have 2 or more cards it's probably best. 

You don't need to plug in the 6 pin on the motherboard unless your running 4 cards sli it says it in your manual.  I have a rampage iv extreme and it says that in my manual as far as psu goes there right you should grab a bigger one the 3930k for example at 4.8ghz oc can pull 500 watts not including your gpus.  I would recommend going ahead and grabbing say a 1200 watt for cushion that is 80 plus gold certified so you have cushion to oc and not destroy your psu.  I blew a 1250 watt seasonic with 3 gpus with modded vbios and 3930k at 5.0 during a bench now I have 2 1250 watt psu just to be safe.  650 watt working under load considering your gpus and cpu.  Its worth the extra cash.  Everyone I   talked to with similar watts thought it was overkill to but after using a kill o watt saw themselves actually approaching the limits with everything under load 

 
Edit: can't post links yet; there is a thread in OCN about titans 2/3/4 SLI ways in the PSU section. Throw an eye in there.
 
take a look at that thread. Pretty informative. There is also a Thread where the OP gives quite detailed information why some psu's are good and why some are a waste of money; name of OP is shilka. You also can take a look at the FAQ which is always a good idea.
 
 
cheers

Might be this one, http://www.overclock.net/t/1383408/gtx-titan-2-3-4-way-sli-owners-which-psu-are-you-using/0_100 
 
Here is the general PSU section
 
http://www.overclock.net/f/31/power-supplies
 
Just as matthew stated with his experiences, I'm also needing more power as my X1250 is at it's limits. 1500W for 3 Titans (aftermarket bios) and a 5 Ghz 3820 + all kinds of fans + watercooling should be enough. 
 
Let us know when you do get your new PSU, even if it's long time from now. I bought the Enermax MaxRevo as reviews for the EVGA 1500 watt were kind of weird.  Unless they updated it to something based on the G2 units I felt safer with Enermax. 

Interesting.... I seen molex plugs on motherboards for extra PCI-E power, but never seen a 6 pin PCI-E plugs mentioned before on a motherboard.
 
with all 7 slots being PCiE 16x I can see why though
 
If you were running quad SLI (8 PCI-E plugs) and needed one for the board (9 PCI-E plugs) good luck with that, I don't know of any PSU's that have that many 

Finally confirmed, 2 more Titans are coming in later tonight to along with thermaltake 1500W PSU.
Now just to confirm, I can plug in any of these 6+2 pins into additional motherboard plug? ofc using 6 only :)
 
ModelConnector TypeConnectors & Cable length1500W24pin1 x 24pin Main connector(600mm)   EPS 12V 8pin1 x EPS 12V 8pin connector(600mm)ATX 12V 4+4pin1 x ATX 12V 4+4pin connector(600mm)PCI-E 6+2pin & PCI-E 6+2pin2 x PCI-E 6+2pin & PCI-E 6+2pin connectors (550mm + 150mm)
2 x PCI-E 6+2pin & PCI-E 6+2pin connectors (550mm + 150mm)PCI-E 6+2pin1 x PCI-E 6+2pin connector (550mm) 
1 x PCI-E 6+2pin connector (550mm) 
1 x PCI-E 6+2pin connector (550mm) 
1 x PCI-E 6+2pin connector (550mm)Molex4 x Peripheral connectors (550mm + 150mm + 150mm +150mm) 
4 x Peripheral connectors (550mm + 150mm + 150mm +150mm)SATA4 x S-ATA connectors (550mm + 150mm + 150mm + 150mm) 
4 x S-ATA connectors (550mm + 150mm + 150mm + 150mm) 
4 x S-ATA connectors (550mm + 150mm + 150mm + 150mm)PATA to FDD adapter1 x PATA to FDD adapter (100mm)
 
Thanks