Well..its just ingame ( Fifa, Crpg, Warband Native) and well ..sometimes it flickers green or red or the desktop gets green or red colours . Also if its really strong...there are big pieces over the desktop..
sorry dont know how to explain :/ the thing is its just in game
Whoa there dude, that is some serious shit going on. The stuff you experience reminds me when you get too greedy with overclocking, and then all kinds of strange stuff shows up. Could it be that your power supply unit is too strong for your setup?
Then there is the obvious, your card is messed up and needs to be replaced. If it is under warranty, waste no time and send it back for either replacal, or repairs.
Or it could be your computer screen, but since the problems started after you replaced the card, it is unlikely.
The last idea I have that there is some kind of problem with your motherboard.