With my case closed my X800XL reaches nearly 170F under load. I've got a Zalman 700-cu installed on it , but when I did I just took the thermal grease from the stock cooler and reapplied it. Now I've got some AS3 that I'm going to apply and hopefully that will reduce temps a bit. Should I go ahead and remove the GPU shim while I'm at it ? Will this make any appreciable difference ? Tell me what you think. Thanks.