I just recently got a RMA Graphics card to replace my old card that smoked and fried by the PCI power connector i replaced my PSU and the graphics card now the new graphics card is showing artifacts and vertical lines on the screen.
MOBO: Gigabyte Z77-D3H
Psu: (New)Xfx 650w psu (Old)Xtremegear 1000w
Video card owercolor 6950 vortex II
Ram: Corsair Vengeance 4gb x2
CPU: i5 3570k
CPU cooler: Coolmaster Hyper Evo(replaced with h60 since the h60 was leaking)
More about :artifacts showing bios screen vertical lines booting windows
Best course of action, try the new video card on a different computer to see if you still get artifacting. Try a game or run OCCT/Furmark on the computer(s) to see if the artifacts come back or the video card crashes. If you can reproduce the artifacts on a different computer, with or without a game/Furmark running, it would signal a faulty video card.
Tried a cheap card in my pci slot and it worked so i'm guessing it is my graphics card...
Those 6950's ran quite warm, I would suggest you try downloading (free) GPU-Z to see what the temperature sensors are indicating while the card is idling. It might be running too warm, if you want to try to fix the card.