Number of cores on NVIDIA K20 GPU in Mathematica

Question

I am using an NVIDIA K20 GPU in Mathematica. The whitepaper for the K20 states the following specs:

1. 2496 single-precision cores (192 per multiprocessor x 13 multiprocessors)
2. 832 double-precision cores (64 per multiprocessor x 13 multiprocessors)
3. 416 special function units (32 per multiprocessor x 13 multiprocessors)

However, when I launch Mathematica and look at the specs of the GPU after loading OpenCL or CUDA, it says that I have only 416 cores (I have attached a screenshot of the Mathematica commands and reported specs). Is this somehow related to the number of double-precision cores or special function units? Mathematica reports these specs before I tell it what kind of code I will write (e.g. double precision, transcendental functions).

Answer 1

It is much more likely that your Mathematica does not yet know about the Kepler architecture yet, and thus translates multiprocessor count into core count incorrectly.

Since "cores" are mostly a marketing invention anyway, you can safely ignore that number. Mathematica will still use the entire GPU (although a Kepler-aware version might still bring some speedup through other optimizations).