I just bought and am setting up a new Gateway 6860 with a AMD Radeon HD 7770 2GB video card. All seemed just fine for the first couple of days. In these last two days, however, the screen image on my LG display has started to shake and shimmy all over the place. Currently it's a combination of a flicker and a vertical jump (back and forth) of about 1/2".
Is the video card bad, or might there be some simple fix to the problem? Thanks.
I shut off the computer and removed the left panel of the case. The ambient temperature was moderate (I thought that excessive heat might have been an issue). After waiting for about 20 minutes, I turned the computer on again (the case is still open). Half an hour later, the video image seems stable.
Heat can certainly play a factor in a video card's performance. I remember on my old laptop with integrated graphics, if the laptop got too hot, the display would do the same thing as what you described. Once I got a laptop cooler for it, never had that problem.
I would make sure you have a good airflow/ventilation system in your case. If the hot air can't escape, the components start heating up and this can lead to excessive wear and tear and reduced performance.
I've run boxes that are substantially hotter than this cool cat without issue. I once had a "ConoGraphics" prototype unit in my IBM PC (late in 1981) on which I could probably have fried an egg! I suspect that heat is not an issue. I will, however check out GPU-z. Thanks for the reference. =)
Video problems can also be caused by your PSU, if your using the stock PSU, or a bad monitor cable, or the monitor itself. Usually any of these in my experience would cause more static, or colored pixels that follow images around. If yours is shaking I can't be to sure, just something to keep in mind. (I kind wished someone would have told me my monitor could have been bad before telling me to get a new GPU, but I wanted a new GPU soon anyway.)
It sounds like comparing apples to apples, but really it's more like comparing apples to oranges.
I'm not convinced it isn't a matter of heat, but assuming that it isn't, you should try a driver cleaner and reinstall the latest video drivers. If I looked at the right Gateway, your PSU should be sufficient, so ... maybe your refresh rate is set too high?