Radeon HD 7690M XT 

It was speculated that the system was actually housing an unreleased dual-GPU graphic card, which would have made sense given the very small size of the system (and mini-ITX motherboard therein).

The card seems close enough to the final stage that we should expect to hear something official soon, but for now it's fun to speculate - unless of course the speculation concerns a high initial retail price, and unfortunately something at or above $1000 is quite likely.

The new Tonga XT-based graphics card should end up faster than both the Tahiti XT-based R9 280X and the GTX 770 while drawing less power, which suggests that this should be a very good piece of hardware in terms of performance per watt.

Our sources report that AMD is indeed planning to introduce an XT version of the Tonga GPU which will not only have a higher Stream Processor count, most likely 2048, but also come with a wider 384-bit memory interface.

As far as cooling is concerned, we have all seen how well the Hawaii GPUs well when they are coupled with water cooling.

ASUS has unveiled their high-performance ROG ARES III graphics card at Computex 2014 which features the dual Hawaii XT cores.

In case you missed them before, Asus launches custom dual-GPU graphics cards under the Mars and Ares names depending on whether they are based on Nvidia or AMD GPUs.

This means that we will be looking at a graphics card which will pack a total of 5632 Stream Processors, 352 TMUs and 128 ROPs, since the single Hawaii XT GPU feature 2816 Stream processors, 176 TMUs and 64 ROPs.