MonnieRock

lehpron
Therein lies the catch 22: There are some that feel they "shouldn't have to" spend seven times more than a GTX780 Ti for a 12GB Quadro K6000, but don't mind the expense of a 4K surround setup.  It is easy to wish/dream of things that aren't options, but when they come into existence, it is like no one plans for the worst (expense) while they hoped for the best.

 
I considered SLI Quadro K6000's for a 4k surround array so, I called nVidia's Quadro department and spoke with their senior engineer to find out the limitations.  Per nVidia, Quadro K6000 is limited to no more than Tri-SLI and for SLI to be functional, be it Dual SLI or Tri SLI, it must be a complete system(s) sold by OEM partners that are "Quadro SLI Certified Platforms". So in other words, the nVidia Quadro Specialist said, "If you build your own system, then buy 3 Quadro K6000's, SLI would NOT work because it is not a Quadro SLI Certified Platform".   He also said, "If building a 4K surround system, 12GB is recommended" 
 
 

lehpron
I'm certain EVGA knows that this thread is full of hype, that the true demand for a 6GB GTX780 Ti is much lower and thus far not worth pursuing-- but they aren't going to flat out say that because it would affect their enthusiast-oriented image by make those demanding a 6GB card feel insecure.  Just easier to shift blame to nVidia...

 
From the information I have received, nVidia is limiting the board partners from producing a GTX 780Ti with greater than 3GB of vram. nVidia will remove this restriction when it benefits nVidia, not the board partners and/or consumers. 
 
 
Thank you,
Monnie
 
 

giltyler
Monnie I respect your tenacity to even consider a solution as mentioned above that would have to be in the $15-20k range for such a platform based system and then the 3 4k monitors on top of that

MonnieRock

giltyler
Monnie I respect your tenacity to even consider a solution as mentioned above that would have to be in the $15-20k range for such a platform based system and then the 3 4k monitors on top of that

 
Everything is relative my friend.   Klipsch THX Ultra 2 is $13K http://www.klipsch.com/thx-ultra2-home-theater-system/details   Some would say "For just speakers, OMG" others would say " Finally a certified system I was looking for".
 
Some are not looking for bargains, they are looking for pure performance solutions. Some are looking for bargains and do not require performance solutions.
 
Most importantly, neither of these groups are any better than the other nor should either be criticized, they are just different groups with different solutions. We all put our pants on one leg at a time.
 
 
Thank you,
Monnie
 
 

 

lehpron

HappyCamel
I may be terribly wrong here, but considering the huge bandwidth of the 780Ti, do you really need more VRAM?

You just need more information and then figure it out yourself.
 
Memory bandwidth is the rate at which the Vram buffer refreshes, it doesn't matter if the GPU is able to render more frames in the same time period if the Vram doesn't refresh fast enough, it bottlenecks everything.  Our frame rate software counters don't count the rate of frames that eventually gets through the computer and onto our displays, it only counts what the GPU is actually doing, which is higher than everything else.  
 
For instance, it is simple math: a rendered scene taking up a 3GB buffer refreshing 60 times per second (or 60Hz) needs 180GB/s to do it (3 x 60 = 180).  Since memory bandwidth is effective clock multiplied by interface width divide by 8 bits per byte, GTX780 Ti has 336GB/s from 7GHz at 384-bit.  
 
336GB/s allows a 3GB scene to be refreshed 112 times per second, or 112Hz max; less Vram will refresh faster but that means more Vram will not, unless the bandwidth is raised.  GTX780 Ti at default 336GB/s could refresh a 2GB buffer upwards of 168 times per second, which is nice for 120Hz displays, better if the GPU actually renders frames between both refresh rates; then everything is aligned in perfect harmony.
 
 
But a 4GB buffer at 120Hz needs 480GB/s, which is 7.5GHz at 512-bit (doable on R9-290X) or 10GHz at 384-bit (not doable for nVidia).  A 6GB buffer at 60Hz is possible now with both AMD and nVidia, which is 360GB/s done at 5.6GHz at 512-bit or 7.5GHz at 384-bit.
 
 
6GB at 120Hz is just not possible with today's technology, which needs 720GB per second bandwidth, and not until nVidia's codename "Volta" (which appears after Maxwell) will we start seeing 1TB/s of internal memory bandwidth.