Great Vids. I love how epic the first one makes the Platinum Order! We should totally do something like a promotion video.
As for the second: That raid looks awesome. How goddamn much health does that thing have >.>
Now for the down side: Those weird frame drops and even freezes look like broken RAM to me. Try doing a benchmark and see how it turns out. Even if it does turn out alright though, my guess would still be, that your RAM is broken. Which is bad, since you use a laptop and can't just switch it out.
You could also install a RAM-Meter and check for annomalies on that.
Only other thing i can think of, is your graphic card. May be, that it has some fried RAM...
Really not an expert though - so keep that in mind aswell