I have a AMD 64 3500+ with a zalman HSF, not sure what model and arctic silver 5 thermal paste. Before I got the arctic thermal paste my system would idle at about 60 Celsius. Now I have the arctic silver 5 thermal paste it idles around 43 Celcius and 59 celsius under full load. I have heard that 28 or 30 celsius is ideal. How can I make the temp go down? Is it something to be worried about at 40 celsius? I have gotten the temp down by 20 celsius.