I grabbed a few iMacs off eBay recently, I was wondering if these (slot loading 600 mhz) were completely silent like the older G3 iMacs? I used one years ago and remember it being nearly silent with the obvious exceptions of the CD drive and hard drive. I assume they're convection cooled? Is the graphics card silent as well? Are they all like this? They'll be arriving at my doorstep on Wednesday, can't wait.