Review: AMD Radeon HD 7990 – The Dual-GPU to be Released

We like massive hardware. That which few can afford, but makes us dream about the benefits that we all wish for our computers. Today, AMD returns to the throne of graphics.


AMD was, with its origins in ATI, the first brand to launch a dual-GPU graphics card on a single PCB. This device, the Rage Fury Maxx was a disaster in terms of efficiency and stability. AMD has learned a lot since then, and its dual-GPU graphics are among the most efficient parallel work systems on the market. Their latest creation is the Radeon 7990 graphics card.

AMD Radeon HD 7990

Technical performance:

Enormous with all capital letters. Such is the Radeon HD 7990 graphics card. AMD has united two 1GHz Radeon 7970 cards within the same PCB in a card format that attracts those who want to show off power. The card measures about 12 “long.

Months ago, some manufacturers, maybe a little restless, integrated two Radeon 7970s on a PCB so many users have been able to see how they work as a team. Now AMD launches its own reference model, enhancing communication between the two chips.

AMD Radeon HD 7990

In it, we find two GPUs with a total of 6GB of GDDR5 memory that give food to 4096 shader engines with a capacity of 8.2Tflops computing power calculations in single precision and over 2Tflops in double precision. This is manufactured with the 28nm process and consists of 8.6 billion transistors.

256 texture units, with a fill rate of 256GT / s, 64 raster units, 256 units Z / stencil and a memory bus of 384-Double Bit memory bus 576GB / s thanks to 6Gbps often based GDDR5 memory. This has the ability to connect to five HD monitors simultaneously (don’t talk about the available connectors) with Eyefinity support. 48 lines PCI Express 3.0 GPU communicate with a theoretical bandwidth up to 96GB / s.

AMD Radeon HD 7990 comparison

The card features technologies that Crossfire users already enjoyed. The Zero Core technology is able to disconnect one GPU, and also significantly reduce the consumption of the other, for when we do not require the full potential of the card.

The card also supports Crossfire use of another card with a GPU, Radeon HD 7970, Radeon HD 7950 with 3GB of RAM, Radeon HD 7990, or others. This allows for adding up to 4 GPUs per system on only two cards thanks to AMD’s Crossfire.

AMD Radeon HD 7990

Format, design and connectivity:

The card is awesome. Large, over 12 “long, dual slots of course, a large sink and powered by three 92mm fans. Among dual-GPU graphics cards, is that AMD cards have always enjoyed powerful turbines and steam chambers.

AMD Radeon HD 7990

The new design allows for direct cooling of the two GPUs, in fact they are now further apart than in other designs, allowing less heat saturation between the two chips. The triple fan design allows less noise than previous designs, but is not without disadvantages. One is having three mechanical parts that can fail, and the air is expelled out of the PC and turbine designs so we have to enhance the removal and / or air into our PC.

AMD Radeon HD 7990 Review

Four 1.2 connectors with a mini Displayport connector and dual-link DVI connector panel crown the Radeon HD 7990. With this card’s connective ability to connect up to 5 HD screens or 4k monitors, if you are lucky enough to afford one.

AMD Radeon HD 7990
The card requires trained boxes for their size, slightly larger than a Radeon 7970 or a Geforce Titan and also requires a considerable power source. My recommendation is a minimum of 750W for one of these cards, with consumption close to 400w (requires two eight pin connectors with 150w per head) and not less than 1000w if you plan to mount two of these in your PC.

AMD Radeon HD 7990

Crossfire enhanced and more:

AMD has done a good job for the system to take full advantage of the processing power of both GPUs. They spared no communication, riding a “bridge” with a surprising capacity of 48 lines PCI Express 3.0 capable of generating up to 96 GB / s of bandwidth. This is almost 3 times faster than the card that communicates, which has the same interface with the PC. This ensures that internally we can take advantage of both GPU with no bottlenecks in the internal communication between the two. Remember that this card uses Crossfire internally and therefore the frame buffer must share the same information between the two GPUs.

AMD Radeon HD 7990

The card also maintains Crossfire connectivity, as we had some clues of before, and we ourselves have been able to test with our reference Radeon 7970. As always, AMD has the most open parallel system and it doesn’t hiccup when put to work all share our architecture and GPU while setting frame buffer size.

Radeon HD 7990 Specs

Of course, the card supports the latest graphics technologies within, eg. DirectX 11.1 that was introduced with Windows 8, but AMD also includes with it a set of eight very recent games (Bioshock Infinite, Dragon Blood Far cry 3, Crysis 3, Tomb Raider, Far Cry 3, Hitman Absolution, Sleeping Dogs and Deus EX Human Revolution), all or nearly all DirectX 11, with which to enjoy the stunning performance of this card.

Bioshock infinite

Bioshock infinite has an high graphic quality with this card.

Crysis 3

Just as Crysis 3 in our test team was moving in a 2560×1440 ultra quality to over 70FPS long as 2x FSAA would be spared.

Performance Tests. I.

MS Flight. 2560×1440. High quality.

MS Flight

BattleField 3. 2560×1440 Ultra Quality.

BattleField 3

F1 2012. 2560×1440. Ultra Quality. 8x FSAA and 16x AF.

F1 2012

Heaven Benchmark 4.0. Extreme Tesselation, 8x FSAA. 1920×1080.

Heaven Benchmark 4.0

Performance Tests. II.

Crysis 3. High Quality. 2560×1440.

Crysis 3

Futuremark 3Dmark. Fire Strike.

Futuremark 3Dmark

Bioshock Infinite. Ultra Quality. 2560×1440.

Bioshock Infinite

No doubt, if you want the most powerful graphics card on the market, this is definitely the Radeon HD 7990. It’s fast, it’s massive and expensive. It has everything to meet modern standards of graphics, but no doubt the trend of prices makes accessing the graphics restricted, and even more so in these times, it is a matter of the few. Superior in almost all our tests, the GeForce GTX 690, also a dual GPU, as well as the Titan. If we have 2000 Euros, two Titan SLI or two Radeon 7990 cards could be purchased, notwithstanding the final consumption.

Analysis and conclusion:

Well, AMD certainly takes the lead with this dual-GPU graphics card. It’s massive, expensive, and is the fastest card you can find on the market. For 919 euros, it’s yours and it includes eight great games to be enjoyed including the magnificent “Bioshock Infinite”, which takes full advantage of potential of this graphics card, in addition to offering a story that lives up to the first installment of this game. AMD regain the performance crown with a graphics card that we wanted to be more economical, but is definitely more than competitive within its high price range.

Radeon HD 7990

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