So I hear all about AS5 and how good it is and how "lapping" your heatsink helps. I've read reports as high as a 10c reduction. So I put it to my own test. I set aside my good old white paste I've been using for years and bought some AS5. I bought a 3/8" piece of glass to tape the sandpaper too and started sanding (yes, sanding, NOT lapping) the heatsink with 400 grit untill I saw that the entire surface had been scuffed. then I switched over to 1500 grit and sanded some more. 15 minutes later and a quick 1 min polish with my favorite metal polish and these are my results. Test: 100% load (prime95 x2) Case fully assembled. Without sanding/polishing with white paste after 20 min = 63c Fully resurfaced and polished with AS5 after 20 min = 63c That said, I'm looking into a better cooler that may do a better job of "wicking" the heat away with heatpipes. Keep them short and plentiful. Did someone say Scythe? Next time I'm not wasting my time "lapping" anything. Oooooo Shiny!!!