It is probably not your system... it sounds like to me you might have some mod soup going on there... I did the same thing at first when I started using mods. Mod soup will drive your graphics card absolutely crazy... are you using a bunch of mods?
If so try removing them all. Get a clean install. Then add big mods first and minor ones last... check after adding each one to find the culprit. Good luck.
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Akula4745
"If you sit by the river long enough... the body of your enemy will float by -- SunTzu"
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