(HELP) Questions about graphics card

[hktony]

AFter i moved to a new home, my PC got a big problem in ALL running movies and game. Also, PC was easily got "hang" while i was playing game.

Here are two pictures captured from a movie and game

http://hktony.150m.com/pic.JPG
http://hktony.150m.com/pic2.JPG

I am not sure what they are, they look like artifacts, but my graphic card is not overheated, its around 5x-6x degree. I have tested with few graphic card drivers, the problem is still here. Even i changed my RAM from DUAL to SINGAL channal, it didnt change anything.
So i really look for help, thank you very much

MY PC CONFIG
A64 3000+
512MB RAM Kingston x2
Harddisk 80GB 160GB 80GB
Enermax 450W
Gigabyte 6600GT
DFI ULTRA-D NF4

 

[Robc1880]

Those are artifacts. What kind of case and cooling do you have? You might want to try getting a box fan or something like that and blow it in the side of the case and see if that will eliminate those for you. I know you said your card isn't overheating, but it can't hurt to try.

 

[hktony]

this didnt work, those artifacts were still there...
By the way, i am using Zalman Cu fan which is shown as below
http://hktony.150m.com/pic3.JPG

 

[Robc1880]

I would do what Wusy says then. If that doesn't work, then are you sure your Zalman HSF is making good contact with the core?

 

[hktony]

i have released the zalman cu fan and install it again ..the GPU temperature is still around 55 degree.I dont think the core is overheated
However, i lowered the ram speed from 1120(default) to 500, this seemed to work properly.
So i guessed there was something wrong in the graphics card' ram
Also, I couldnt see any artifacts again in movies and games.
But it failed to complete 3d Mark 2003 finally, but a score was shown

 

[Robc1880]

if your card isn't able to run full speed without artifacts then you need to RMA it.