So I got my 1.7 Nord running pretty well on 1.9. So I backed it up, installed all three DLC and took a risk, just a teeny bit more lag, and stutters when entering DLC area, and it lags A LOT when taking at least 50 points of health damage. Dark Souls lagged, but it's all in third person so it didn't bother me, ao I figured the same for Skyrim, I was right, it doesn't bother me as much as in first person, but it does break immersion a little. So yeah, so far, so good.