Carbon-based composites are gaining interest in the field of heat dissipation. It is an important issue in different sectors due to the aim of prolongating the lifespan of equipment and avoiding its soon deterioration and requirement of replacement or removal, which involves significant quantities of money in different sectors. On another note, there is nowadays a tendency to the miniaturization of devices, which leads the problem of heat dissipation to become an obstacle for their development due to the low efficiency of the current heat sinks that can produce deterioration of equipment because of an increase of the temperature. For that reason, heat dissipators must be adequately designed to ensure the correct heat transfer and, therefore, the selection of the correct material is highly important. However, there is still too much research to do. Therefore, this manuscript focuses on a novel family of graphite-metal composites as the graphite-chromium composites. This research studies the influence of the powder processing method (mechanical mixing and colloidal processing route) and the sintering temperature (1600, 1700, 1800, 1900 and 2000 °C) on the properties of the composite. Differences are identified depending on the powder processing method as the best properties (relative density, electrical conductivity, thermal conductivity, young modulus and flexural strength), measured in the in-plane direction, are at 2000 °C for the powders processed by mechanical mixing (89.46%, 0.6089 MS/m, 209.3 W/m·K, 41.6 GPa, 43.8 MPa) and at 1900 °C for the powders obtained by colloidal processing method (93.57%, 0.7509 MS/m, 370.1 W/m·K, 51.4 GPa, 117.5 MPa). Moreover, properties clearly outstand at each temperature in the composite obtained from colloidal synthesis powders with a lower sintering temperature. Thus, graphite-chromium composites could emerge as an alternative in heat dissipation applications.