VR-Zone claims that AMD decided to implement a rather exotic power supply circuitry. Instead of using two 8-pin PCIe power connectors, AMD decided to utilize four 6-pin PCIe connectors. Those four 6-pin connectors lead to a multiphase power regulation, divided into three groups. The major groups consist out of Tahiti XT (not the XT2, i.e. the GHz Edition), 3GB GDDR5 memory per core (clocked at 1.5GHz) and the PLX PCIe 3.0 controller.
The Radeon HD 7990 is projected to be more affordable than Nvidia's GeForce GTX 690