Well, it doesn't surprise me then. I think the i5 is the sweet spot as far as SP3's go. Just powerful enough, but not too powerful for such a small space.
All that being said, I had a little scare of my own, on my i5. I was just surfing the Internet yesterday, and decided to go to NORAD to track Santa on their website. I've never seen the RAM usage so high, and the whole right side of my SP3 was hotter than I've ever felt it! I decided it wasn't worth taxing my SP3 tracking an imaginary man, and left the page. My RAM usage went up as high as 3.7! It's never been that high. (I know because I was monitoring.)