The Valve Hardware Survey detected incorrect values:
DirectX Card: AMD Radeon HD 6900 Series
VendorID: 0x1002
DeviceID: 0x6719
Number of Monitors: 3
Number of Logical Video Cards: 3
No SLI or Crossfire Detected
Primary Display Resolution: 1920 x 1080
Desktop Resolution: 4250 x 1680
Primary Display Size: 26.65" x 15.00" (30.55" diag)
67.7cm x 38.1cm (77.6cm diag)
Primary Bus Type Not Detected
Primary VRAM: -2048 MB
OS Install Date: Jan 01 1970
I actually only have one physical video card which has 2048MB of Ram. Connected to it are 3 Monitors (maybe that's why there's 3 logical ones?) - the primary one being 1920 x 1080 at 23", not 30.55", and a 1280 * 1024 (17") and a 1050*1680 (20") besides it.