Just curious. I'm returning a Zalman 9700LED (it doesn't support PWM auto speed) for a Zalman 9700NT (has the 4-pin connector for BIOS auto speed) and am curious if I should try Arctic Silver 5 instead of the Antec Formula 5 I've been using. Is there any difference? I usually spread a thin layer on both my CPU and the bottom of the heat sink and am obviously looking for the best performance and stability...I want to put the heat sink on once and for all and get maximum cooling. The both appear about the same but I see so many more customers of Arctic Silver.