Paper comparing cuSPARSE, CUSP, ViennaCL and MKL

Accelerated Computing GPU-Accelerated Libraries
1

[url]Comparison of SPMV performance on matrices with different matrix format using CUSP, cuSPARSE and ViennaCL | hgpu.org

cuSPARSE seems to be the champ of the sparse Linear Algebrea Libraries, and handily beats MKL by a large factor.

Also this paper directly compares the different sparse storage formats(COO,CSR, Hybrid) which is particularly interesting.