The Radeon HD 6990 was an enthusiast-class graphics card by AMD, launched on March 8th, 2011. Built on the 40 nm process, and based on the Antilles graphics processor, in its Antilles XT variant, the card supports DirectX 11.2. The Antilles graphics processor is a large chip with a die area of 389 mm² and 2,640 million transistors. Radeon HD 6990 combines two graphics processors to increase performance. It features 1536 shading units, 96 texture mapping units, and 32 ROPs, per GPU. AMD has paired 4 GB GDDR5 memory with the Radeon HD 6990, which are connected using a 256-bit memory interface per GPU (each GPU manages 2,048 MB). The GPU is operating at a frequency of 830 MHz, memory is running at 1250 MHz (5 Gbps effective). Being a dual-slot card, the AMD Radeon HD 6990 draws power from 2x 8-pin power connectors, with power draw rated at 375 W maximum. Display outputs include: 1x DVI, 4x mini-DisplayPort 1.2. Radeon HD 6990 is connected to the rest of the system using a PCI-Express 2.0 x16 interface. The card's dimensions are 310 mm x 115 mm x 40 mm, and it features a dual-slot cooling solution. Its price at launch was 699 US Dollars.