There's been a slight increase in noise since I installed my 3rd-party RAM with heatspreaders, and I'd like my Mac Pro to run as quiet as possible, so I've had a look at these: http://www.thecoolingshop.com/product_info.php/products_id/619 Has anyone got any experiences with them? Copper or Aluminium? Any suggestions for placement? These are 5mm deep so should I fit them front and back? I'm assuming it would be better to place them with the grooves horizontal to better channel the airflow from the fans. I'm sure some manufacturers must produce heatsinks of the same dimensions as Apple's -- I just can't find any.