So I ordered a 3rd EVGA GTX Titan Black Superclocked Signature Edition today, but it was not my initial plan to go TRI-SLI.  Here is the almost short version of the course of events:
 
1. I ordered [1] EVGA GTX TB:SC to replace [3] 8800 GTXs in TRI-SLI.
2. The original retail packaging arrived damaged.  Sure, it is only a box, but after paying $1,100, would you not want your box to be perfect?
3. I called Newegg customer service.  I was told they will approve an RMA, but unfortunately, they were OOS, so I had to wait for more stock in order to secure a 2nd and RMA the 1st.  I was also told to test the 2nd and decide which to keep.
4. The 2nd arrived and well, guess what, the SLI bug bit me.  I could not order a 3rd to replace the 1st because it went OOS again and Newegg placed a 1 item per customer limit.
5. The EVGA TB:SS was back in stock again today.  I finally ordered the 3rd to be able to RMA the 1st, in order to maintain SLI.  But now, I am having second thoughts about returning the 1st and going TRI-SLI instead.
 
As the title states, if I do go the route of TRI-SLI, what kind of power should I be providing?  I am currently powering [2] TB:SS in SLI with a Thermaltake ToughPower W0132RU 1000W PSU.  Though somewhat dated (circa 2008), this PSU powered [3] 8800 GTXs and have not skipped a beat on powering [2] TB:SS.  However, I suspect my current PSU will be out-classed for a TB:SS TRI-SLI setup.  On the contrary, based on my research, this PSU is rated to be capable of powering TRI-SLI as with my former 8800 GTX TRI-SLI setup.
 
Research: http://www.bjorn3d.com/2009/02/thermaltake-toughpower-w0132ru-1000w-power-supply/
 
Here are my questions and concerns for the ever-so-swag EVGA community:
 
1. Is my current PSU up to par?  If not, recommendations?  I am hovering over the "Corsair AX1200i" or "EVGA SuperNova 1300 G2"
2. Is TRI-SLI worth the investment?  Yes, I will OC.  However, nothing too extreme as, in SLI, temps are in the 80 degree Celcius range (TMax: 85C) at load.  No, GPU water-cooling is not an option for me.
3. My Asus Maximus IV Extreme-Z is TRI-SLI capable, thus allowing for space between GPUs in SLI and leave no accommodations with TRI-SLI.  In time (within the year), I will upgrade to a Quad-SLI capable MOBO.
4. Thus, will a year of 80C range temperatures in TRI-SLI, significantly impact my GPUs?  I do have a laptop which I use more on a day by day basis.  I am on my gaming PC a maximum of 3 days or 24 hours a week.
5. Are there any other concerns I have not mentioned?
 
As always, many thanks and kudos in advance!

Gomez99
I would not recommend 3 way sli, it doesn't scale well and driver support is horrid. But if you do go with the evga 1300. Corsairs psus recently have had a lot of bad batches

You are probably right.  TB:SS in TRI-SLI is probably overkill.  However, you know I will be opening up the 3rd, testing it out in TRI-SLI and taking pics!  Unless my PSU says otherwise.

 Go here in this forum

http://forums.evga.com/tm.aspx?m=2149085

Post #5 will give you most answer to your question as far as Tri Sl pros and cons
 
 

AWK16
 Go here in this forum

http://forums.evga.com/tm.aspx?m=2149085

Post #5 will give you most answer to your question as far as Tri Sl pros and cons
 
 

Thank you.  I have been keeping up with that thread.  Yes, temperature is definitely a key determinant in going TRI-SLI.  I am fully aware of this from my previous 8800 GTX TRI-SLI setup.  And man, did it get hot in my office.  I am finding my current TB:SS SLI setup to be manageable.  GPU temps hover in the 30C range at idle and 70C range under load with max settings on BF3.  Benchmarks with Unigine Heaven/Valley and 3DMark saw higher temperature with a TMax of 85C.  My office is beginning to "warm up" with the current SLI setup, so I am somewhat concerned that transitioning back to TRI-SLI without water-cooling may not be the best decision.

3 cards scales very good, It depends on your RES,  I have 4 gtx 780 TI classifieds,    At 4K res  The scaling is exelent  4 cards at 1080P only  Then it sucks  2 and 3 cards at 1080P and 1440P is exelent

When we configured a machine with 4 titan blacks, we had to go from a high quality 1200w unit to a silverstone 1500.  3 standard titan black cards worked ok in the 1200w, on a 2011 socket platform!

Thank you all for the excellent advice!
 
The prospect of TRI-SLI is certainly unraveling other weak links in my gaming PC that require attention.  I had a feeling this would happen.  It is common when upgrading to new, ultra high-end components and mixing with "older" components.  Incompatibilities and non-optimal conditions will arise.
 
1. PSU: Bye-bye 1KW.  Hello 1.2-1.5KW.
2. COOLING: I must upgrade/add case fans until water-cooling can/will be an option.  If only EVGA developed a complete, self contained, closed-loop AIO water-cooling system for high-end single GPU to Quad-SLI systems (sold separately and only compatible with hydro copper) with a versatile water-proof clamping system that would allow for future GPU additions.
3. MOBO: Quad-SLI capable.  I will try to be patient until X99 arrives.
4. CPU: My current Intel i7-2600K with a daily use OC to 4.6GHz will be a source of eventual bottleneck.  Any rumors/news on what CPUs will be associated with the X99 MOBOs?  5th generation Intel?
5. CASE: I may as well upgrade my CoolerMaster Cosmos-S case also. With water-cooling in the foreseeable future, a larger, mover versatile case would be most beneficial.  I have been eyeing the successor of my current case (CoolerMaster Cosmos 2 Ultra) or the Corsair 900D.