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On the example of a reference AMD Radeon HD 7990 2x3072MB 2x384-bit GDDR5 (1000/1000/6000 MHz).

Features:

• GPU: Radeon HD 7990 (Malta)
• Interface: PCIe 3.0 x16
• GPU clock rate (ROPs/shaders): 1000/1000 MHz (standard)
• Memory clock rate, physical (effective): 1500 (6000) MHz (standard)
• Memory bus: 2x384-bit
• Stream processors: 2x2048
• Texture units: 2x128 (BLF/TLF/ANIS)
• ROP units: 2x32
• Dimensions: 310x100x36 mm, dual-slot
• Board color: black
• Power consumption (3D peak/2D/idle): 389/95/3 W
• Display connectors: Dual-Link DVI, 4 x Mini DisplayPort 1.2
• Multi-GPU mode: hardware CrossFireX

This is essentially a couple of smaller Radeon HD 7970s on a single albeit long PCB. The power circuitry managed by digital controllers is shared by the memory but is separate for each graphics core. This is done so that the two GPUs will interoperate smoothly. For the same reason, by the way, you can't disable the CrossFireX mode in the driver settings.

This card features its own audio codec, so nothing else is required to output audio to HDMI.

This card has two 8-pin supplementary power connectors.

There's also a very interesting feature called "ZeroCore Power," which is basically card's ability to hybernate when monitor turns off after a period of inactivity. Usually, a graphics card remains in the same 2D mode, at same clock rates. With ZeroCore Power, any Radeon HD 7000 considerably reduces clock rates, consuming just 3W, then stops the fan. Moreover, in a CrossFire configuration, as soon as cards go out of the 3D mode, only the first card continues to work while the remaining ones go into the aforementioned hybernation. A very nice feature we'd say!

We thank AMD for the provided graphics card.

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