A Closer Look
AMD's cooler uses a large Vapo-Chamber baseplate to soak up heat generated by the GPU core. The cooler also cools memory chips and voltage regulation circuitry. Hot air is blown out of the case.
The card requires a 6-pin and 8-pin PCI-Express power connector. This configuration is good for up to 300 W of power draw.
AMD has also included their Dual BIOS feature with the R9 290. Unlike the R9 290X, there are no separate BIOSes for "quiet" and "uber".
This is the first time I see the International Rectifier IR 3567B controller on a graphics card. It is functionally very similar to the CHiL controllers we've seen on previous generation cards and provides software voltage control and extensive monitoring via I2C. Being a new device, though, it might take a bit until it is fully supported in overclocking software.
The GDDR5 memory chips are made by SK Hynix and carry the model number H5GQ2H24AFR-R0C. They are specified to run at 1500 MHz (6000 MHz GDDR5 effective).
AMD's Hawaii graphics processor uses the GCN shader architecture. It is produced on a 28 nm process at TSMC Taiwan, with 6.2 billion transistors on a 438 mm² die.