i was using the thermal pad for a while when i built my system, but i found the cpu's temp was very hot. so i scraped that $h!t off (yes scraped.. it melts between the processor and heatsink) and put in a basic thermal compound (not even artic silver) and the processor dropped about 10 degrees in temp, when fully loaded even more.
i trust if i appplied artic silver id see even more of a drop, my advice... paste not pad! just get the right amount!!!