Titan Z delivers more than 1.3TF in aggregate, I believe.
Your suggestion is reasonable. My previous comment was based on this statement you made:
“but 400 GFlops FP64 is required per workstation”
which I seem to have misinterpreted. You simply want an aggregate of 15TF available along with compute capability in every workstation. Your suggestion gets you there. You might consider putting a GTX 970 in every workstation, and have 12 of those also include the Titan-Z as an “extra” GPU:
40 x GTX 970 = $12K
12 x Titan Z = $18K
(using your cost figures)
This will give you some additional “consistency” across the cluster. Every workstation will have the GTX970, so it has the latest compute capability (cc5.2) and a given code targetting the 970 should run anywhere. Then you have 12 “super” workstations that have the Titan Z and deliver most of the aggregate FP64 flops.
Titan Z gives more than 1.3TF in aggregate, I believe. Looking at both GPUs together, I believe the DP flops can be up to approximately double that number:
So given the constraints, I believe the above config would increase the delivered aggregate DP flops, and give you the latest compute capability on every workstation, for development consistency.
Sorry you’re having trouble with the other inquiry you made, but perhaps it is not the best portal to ask about a sales-oriented question (and there’s been a holiday period recently). If you are working with a system integrator, such as Supermicro or the like, to help you build your workstations, they should have staff who can answer your questions. If you are doing the work yourself, then this forum is a reasonable place to get opinions. It’s not clear how to maximize your offering unless you define the specific maximization criteria precisely. I believe my suggestion offers more aggregate peak theoretical DP flops than yours does, but that is just one criteria.
And if you don’t desire the development consistency across the cluster, you can further increase your aggregate flops by going to something like:
25 x GTX 970 = $7500
15 x Titan Z = $22500