Before we can help you at all, can you please provide more information about your entire system? Fill the following in AS MUCH AS POSSIBLE. ALL OF THIS IS VERY IMPORTANT.
- include the specific brand & model (ex: ASUS Radeon HD7970-DC2-3GD5)
- if any over-clocking is being done then provide GPU & memory clocks, and the application used to over-clock
AMD Catalyst Driver Version, and Driver History
- include driver version currently used, and version(s) tested previously
- 32-bit/64-bit; Service Pack, etc..
- include details about additional operating systems also tested
- include specifics on symptoms, and steps to reproduce the issue
- describe in detail the issue experienced
- for 3D Games, please include details of your in-game graphics settings (ex: Anti-Aliasing, VSync, etc..)
- links to videos or pictures that may demonstrate your issue
Motherboard or System Make & Model
- include the specific brand & model (ex: DELL XPS 8500, or ASUS M4A88TD-V)
- include specific brand & model with output wattage
- a link to the manufacturer’s product page with specifications, or a picture of the unit’s label is helpful
Display Device(s) and Connection(s) Used
- include specific brand & model (ex: DELL U2411)
- include specifics about any cables, adapters, splitters, hubs, used
Applications and Games
- list out all applications and games where the issue is occurring
- include details about version or patch numbers
- include model, speed, number of cores (ex: AMD Phenom II x4 965 Black Ed.)
- if any over-clocking is being done provide details about it (ex: multiplier, voltages, clock speeds, and the application used to over-clock)
Motherboard BIOS Version
- the BIOS version is displayed as soon as your system is powered on (ex: ASUS BIOS 1015)
System Memory Type & Amount
- include specific brand & model
- include specifics about the harddrive(s) used (ex: SSD boot drive), # of case fans, optical drives installed, or any additional PCI, or PCIe devices installed
- include information about any system checks that have already been done to ensure the system is clean of viruses, spyware, etc..
- include information about any checks that have already been done to ensure hardware is not faulty. (ex: hardware swaps, Prime95 for CPU testing, Memtest86 for memory testing)
From the looks of it, it may be a dying card...but not 100% sure.
Also, when was the last time you cleaned the card out form dust? Make sure you clean the inside of the metal cooler heatsink.
You don't want this to happen:
FX-8350 @ 4.8GHz // ASUS Crosshair V Formula 990FX // Sapphire Vapor-X HD 7970 + Dual-X HD 7970 // Thermaltake Frio w/ push-pull (using Antec Formula 7 Nano-Diamond + Cooler Master JetFlo fans) // 8GB (2 X 4GB) G.Skill RipJawsX 2133MHz // Corsair TX850 850W // Corsair Force GT 120GB SSD (OS) // Kingston V200+ 120GB SSD // WD Caviar Black 1TB // Windows 7 Ult x64