Specs:
Intel Core i5 2500k 3.30ghz
4gb DDR3 RAM
Radeon HD 7870

When I use the Enhanced Lighting and FX mod I get a bunch of glitches when I enter a tavern. I'm not sure if it's the case with every tavern, but these screenshots were taken at Whiterun's Drunken Huntsman. Maybe it's because the taverns use the mod's enhanced smoke effects?

http://i.imgur.com/cxz0wUw.jpg
http://i.imgur.com/ZtjQJGN.jpg (note the faint pattern at the bottom, too)

Disabling the mod fixes this issue. The tricky part of this is that I'm not sure that it's not my graphic's card. I also get the occasional flickering texture or shadow in Skyrim and in a few other games, and I've experienced somewhat similar square/pixel looking patterns in one spot in one other game (Far Cry 3.) My temperatures seem fine, the card runs nice and cool. I've tried cleanly uninstalling and reinstalling the latest AMD drivers at least 4 times. Today I opened the case and made sure the card was seated.

I posted about this problem on a hardware forum. One member said that he had similar Far Cry 3 issues, also on a 7870, making me think it wasn't just my card. But having similar problems in Skyrim (and other games), too...

So if anyone knows why this is happening with this mod, or why it's happening at all in any games, I'd appreciate advice. I'm willing to return the card if it's a hardware problem, but I'm having trouble being sure. I'm far from an expert on problems like this.