We just released MAGMA 1.0 but didn't include the ZGEMM. We will add it within a month. We have developed it based on autotuning and it exceeds the CUBLAS's equivalent in performance. See
Jakub Kurzak, Stanimire Tomov, and Jack Dongarra, Autotuning GEMMs for Fermi
, UT-CS-11-671 (LAWN #245), Apr 18, 2011.