Model Name HIS 6990 Fan 4GB GDDR5 PCI-E DVI/4xMini DP
Chipset Radeon HD 6990 PCIe Series
ASIC RadeonTM HD 6990 GPU
Manu. Process (Micron) 40nm
Memory Size (MB) 4096
Memory Type GDDR5
Engine CLK (MHz) 830Mhz
Memory CLK (Gbps) 5Gbps
Memory Interface (bit) 256
Power Supply Requirement 750 Watt or greater power 
Max. Resolution 2560*1600 (Single Display)
Bus Interface PCI Express x16
Mini Display Port 4
HDMI No
DVI Dual-link DVI-I
VGA No

HD 6990 System Requirement

PCI Express ® based PC is required with one X16 lane graphics slot with 2 slots space available on the motherboard
750 Watt or greater power supply with two 150W 8-pin PCI Express® power connectors recommended (1000W and four 8-pin connectors recommended for AMD CrossFireX TM technology in dual mode. 1200W recommended for optimal performance).
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
Minimum 1GB of system memory
Installation software requires CD-ROM drive or DVD –ROM drive, a keyboard, a mouse, and a display
DVD playback requires DVD drive and a DVD
Blu-ray™ playback requires Blu-ray drive and a Blu-ray disc
For an AMD CrossFireX™ system, a second AMD Radeon™ HD 6990 Graphics card, an AMD CrossFireX™ Ready motherboard and one AMD CrossFireX™ Bridge Interconnect cable is required
Use of 3 or more displays with AMD eyefinity technology requires a Display Port-capable panel or an AMD Eyefinity validated dongle. See http://www.amd.com.EyefinityDongles for a list of validated Display Port dongles.