So, my black C2D MacBook has been up and running for the past three hours, and there is absolutely no hint of CPU whine! That's my happy ending to a very sad tale of one bad rev. A MacBook after another... This is the FOURTH MacBook I've had in the past six months. The first one was damaged right out of the box (misaligned case, and screwdriver scratches all over the bottom), so Apple replaced it. The replacement machine developed a really loud, grindy noise coming from the fan, and after two trips to the Apple repair center with no improvement, Apple finally agreed to replace that machine last week. The replacement had a nice, quiet fan, but plenty of CPU whine. Still not ideal, but I was resigned to live with it. This morning, I learned of the C2D update. Fortunately, every time the Apple Store in Ginza, Tokyo, issued me a replacement machine, they also issued me a new sales receipt. So, I took the replacement MacBook I got last week to the Apple Store today, showed them my receipt for the latest replacement (indicating that I was within the 14-day return period), and asked for an exchange. I had to pay the restocking fee, which amounted to about $150. The way I look at it, I paid Apple about a dollar a day for the last five months to "rent" their rev. A MacBooks until the rev. B's were released! Needless to say, I'm a very satisfied customer right now. Whisper-quiet, super-quick and brand-spankin' new!