Do CUDA cores stack in SLI

[Syndicution]

I am about to SLI two GTX Titan Black's for CUDA stuff, but is getting the 2nd card helping anything or is it like VRAM?

 

[dwatterworth]

It fully depends on the program you are using. There are a lot of HPC oriented programs that do take advantage of every little resource you can possibly dedicate to it.

Other less research / number crunching programs such as real-time-rendering applications for 3d modeling programs often/usually cannot utilize multi-card setups.

 

[Nicholas Tindall]

They can stack, for rendering and similar; as said already check the specific software.

Generally, don't use SLI for purposes other than games as the process can cause issues. Again check the software. If you need the memory, remember than for rendering, as an example, only one card's memory is used.