That means the core comes in at 880MHz and the 4GB of GDDR5 that's present on the PCB comes in at 5500MHz QDR. Connectivity comes in the form of a Dual-Link DVI, Single-Link DVI, HDMI and two Mini DisplayPorts.
Performance on this one can probably be figured out by overclocking the HD 6990 but really the HD 6970 X2 makes the HD 6990 look like a card I'd put in my moms PC. Sporting Three 8-Pin PCI-E connectors for up to 600 watt of power, connectivity of the GPUs via the Lucid chip and more PCB then your standard motherboard the HD 6970 X2 looks like an absolute beast.
If the HD 6970 X2 seems a bit of a pipe dream the HD 6870 X2 could be the card for you. Based on two HD 6870 cores using the Lucid chip again to connect the GPUs the card looks much more realistic for people.
With a 900MHz core clock and the 2GB of GDDR5 coming in at 4200MHz QDR this is essentially the same as having two HD 6870s in your system in a single card. Connectivity is the same as the HD 6970 X2 which means a Dual-Link DVI, Single-Link DVI, HDMI and two Mini DisplayPort connectors.
The card requires two 8-Pin PCI-E connectors to get up and running and overall just looks like something that is a lot more realistic for most users.
Still that's no excuse not to have two HD 6970s X2 running your Eyefinity setup.
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