I've built a new pc by myself and it's working well.
The problem is, that I have artefacts (pixels) when playing a game.
I play World of Warcraft and if I have graphic details at "Ultra", there are so many artefacts, that playing is not fun anymore.
If i set shadow, water etc. details to low, the artefacts are shrinking and are not gray anymore. There are a few, but it's playable! But i want to play completly without artefacts, since the card was very expensive.
I thought, that it's a World of Warcraft related problem. I've installed "Star Wars The Force Unleashed II", having the same artefact problems (even on startup).
While surfing, using applications or watching movies (even HD), there are no artefacts!