EVGA SR-2, with waterblocks.
The rendering per gpu is +16% faster than my old GTX580.
Same GPU as TiTAN, GK110, 7.1 billion transistors
7x GK110  = 49 billion transistors in one pc.
3 powersupplys.
Draw around 2600w +
24GB of ram for stability and speed.  home welded frame.
A separate big watercooled machine with 10x 40mmx40mm Peltier to hold the 2 x cpus at around 18c and 4300mhz   
The cooling systems hold one fat 80mm 4x120mm and a 80mm 3x120mm radiator.
4xrenderslaves with dual dual 56XX with total capacity of 96HT cores and 48GB ram.
 

Got 95% of the stuff, it is the biginning of the build,
the graphic cards and mobo is in Place in the chassi,
Also the cpus and waterblocks.  
Can post some pics on sunday.
Regards Robban

The GTX 580 is doubt a Winner in most of cuda applications.
Really blending fast.
I buy old stuff so for me the 780 is a cheap upgrade, fits my wallet :-)
3GB standard, and for me 100% more Ram.
Future upgrade : 5 old TiTAN 6GB + my 2 gtx 780 strix give me 6GB.
 
Im going to mount the PSU`s behind the GTX if it fits.
But high up so the air flow from 4x120cooler runs under PSU and over SR-2.
 
 
Inside house,, no way !  we have a cat too and the noise is to much.
In a Little garden house on property :-)
 
SR-2 is still a killer when overclocking and 3ds max likes fast cpu´s
A Little welding on case/chassi next week to secure the GPU`s and mobo and build a new PSU holder.
 
The big 4x120 is only the cooler Before the watercooled thermal cooling maschine.
Im not finish with the build yet so
Maby in  1-2 months. 
 
i really want the cpus to go to max 18celsius when rendering.
It is easier to overclock when cpu is cooler. 
My new PSU link adapters.
for multiple PSU 
 
 
 
     

Where did your Get This Little Bad Boy?

I could use a few myself.

Are you seriously saying that a 780 is only 20% faster than a 580 for rendering? That doesn't sound like a worthwhile upgrade.

The SR-2 isn't actually that great, even OC-ed. My seat of the pants perception is that my machine is noticeably more responsive with the non-OC-ed Supermicro X8DTH than it was with the OC-ed SR-2 (all other components exactly the same, as per the sig). And the X8DTH setup runs significantly cooler with 2 fans fewer.

X8DTH series has 7 PCIe slots, same as the SR-2, although you lose 2 DIMM sockets if you want to use a full length card in slot #1. You may be able to work around that by using ultra low profile DIMMs.

The other advantage of the X8DTH is that it is a smaller motherboard, and the top slot fits against the top slot on the case. With the SR-2, the motherboard's slot #1 actually lines up against slot #3 on the case, so you lose 2 slots on the case. Which in turn means you could use a PCIe ribbon cable and have the 5th dual slot GPU in the case. You will need something proprietary to get the last 2 GPUs in if you really want to run with 7. You will also almost certainly need to slow down PCIe to v1.x speeds if you are using PCIe ribbon extenders.

Note that I am not talking about PCIe base clock speed but the protocol version. To use PCIe ribbon cable extenders you have to use a motherboard that will let you reduce the PCIe protocol verision down to v1.0 or v1.1. PCIe 2.0 and later will not work.

Build pics.
Have to rebuild the graphic-card lock.
Asus 6GB is higher.
Did a a frame around the mobo to secure it.
More pics on sunday :-)

More

More parts for my CPU TEC watercooling machine.
The 120mm aluminium blocks is massive/solid
I start with 350-400 Watt cooling capacity with 6x 40x40mm peltier.
Hopefully it will cool the cpu`s to 15-18c.
 
if it dont work i expand from 6x-12x =350-700watt cooling
And maby the first start of the SR-2 in a couple of weeks.
 
Still waiting for some ordered blue highflow adapters.
 
 
 
 
 

Great stuff, Robbanswe!

3 mobo with waterblocks.