The two GPUs are each served by six 64-bit memory controllers, which are in turn connected to two 256MB GDDR5 memory modules each, for a grand
total of a whopping 6GB of available graphics memory (3GB per GPU). The memory frequency has also been left at the stock HD 7970 3GB setting of
1.375GHz (5.5GHz effective), giving both GPUs a total memory bandwidth of 264GB/s.
Physically, the length of the custom PCB is 294mm, but the gigantic triple slot cooler extends this measurement to 312mm. With such a large
card, it's especially important to ensure that your case can house it, particularly before dropping £700 on it. Weighing in at a massive 1.8KG
it's no surprise that Club 3D have included a support column with the card to prevent the PCB from bending over time.
The HD 7990 6GB also sports numerous outputs and supports six-screen Eyefinity, although there's oddly only 5 display outputs. A dual-link
DVI and single-link DVI sit alongside two mini DisplayPorts and an HDMI connection on the rear I/O panel. It's here that you'll also find the
cards Big Red Button, which when press supposedly overclocks the card's GPUs from 900MHz to 925MHz. This is a fairly pointless and minimal
overclock, and in testing we found that the GPUs boosted to 925MHz under load regardless of whether or not the button was pressed in. A
CrossFire bridge is provided for anyone crazy enough to want to run two of these monsters together in Quad CrossFireX mode.
The monstrous cooler and its housing are what lend the card its hefty weight. Two copper baseplates (one per GPU) are connected to the
aluminium fin stacks by five heatpipes each. This massive clump of metal is cooled by the two side 92mm fans and single 80mm fan in the middle.
The black metal enclosure will ensure that much of the card's hot air will find its way out of the rear of your case, but some will still be exhausted back into your case's internals. for complete review see resource
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