Major Lag on Good System?

After downloading skyrim on a second rig I put together and starting it up for the first time on this comp, I can see I am having a lot of issues with it. The intro all the way up to where you choose whether you choose to follow the imperials or stormcloaks works fine, but when I side with the stormcloaks and enter the building with the light shining from the top, my machine takes a massive fps dump. It appears to really hurt when I am looking at something very light intensive. For instance, a flowing torch on a dark staircase. I gunned it to leave the dungeon, and once I was out, the FPS were slightly better but they were far from great. I can't look at a campfire without my fps dropping below 20fps. Could someone please help me.

SKYRIM SETTINGS

Skyrim Graphics Settings: High (default for my system)
Game controller mode off
1680x1050

Computer Specs

Asus Rampage 3 forumla
i7 950 @ stock
1333mhz 6gb corsair XMS3
GTX 460
Some HP Sata HDDs (I recycled off old comp)

I have the latest graphics drivers and my HDD isn't fragmented at all.