http://www.tomshardware.com/news/AMD-Radeon-HD-7990-Malta,22146.html
ChinaDIY has exposed the final specifications of AMD's upcoming Malta HD
7990 graphics card. None of the specifications are particularly
surprising, as from the beginning it was already a certainty that the
graphics card was essentially two HD 7970s slapped onto a single PCB.
Any specifications that have come to light have already been leaked more
than once, so the convenience of a repeated sample had us all arrive at
conclusions rather swiftly.
First, the card features two Tahiti XT cores that are built on 28 nm
lithography. As a result, the total transistor count reaches 8.6
billion. The HD 7990 features 4096 Stream processors, 256 TMUs, and 64
ROPs, all seated half-half on each of the two GPUs. The GPUs' clock
speeds will be exactly 1 GHz. The only specification that remains
unknown is what the Boost clock speed will be, or whether there will be
a Boost clock in the first place. The graphics card also features 6 GB
of GDDR5 memory, with 3 GB assigned to each GPU. The memory runs over
two 384-bit memory interfaces at 6 GHz.
With these specifications, the graphics card plows through an impressive
8.2 TeraFlops, and the memory carries a shocking 576 GB/s bandwidth. To
make all this computing power happen, the card has been equipped with
two 8-pin PCIe power connectors, resulting in a maximum total power
consumption of 375 watts. It would also support DirectX 11.1.