In this work, graphene nanoplatelets nanofluids (GNPs) thermal and hydrodynamic performance is observed experimentally in comparison with distilled water on integral fin heat sink. Water based GNPs nanofluids is used with 10% weight concentration. Experimentation is performed in laminar range at heat flux of 47.96 KW/m(2), 59.95 KW/m(2) and 71.94 KW/m(2). Higher pumping power is noticed for GNPs nanofluids as compared to distilled water. From inlet to outlet of heat sink, rise of local base temperature is observed for both distilled water and GNPs nanofluids. With the increase of heat flux, GNPs nanofluids thermal performance decreases. Using GNPs nanofluids, the lowest base temperature and maximum convective heat transfer enhancement is noted as 36.81 degrees C and 23.91% corresponding to Reynolds number of 972 for heat flux of 47.96 KW/m2, respectively. Pumping power requirement depends upon flow rate and heat flux, and it is found to be maximum 0.04 W for GNPs nanofluids at heat flux of 47.96 KW/m(2). (C) 2016 Elsevier Ltd. All rights reserved.