There's another way to drop temps a bit if you're interested, without the underclock...
Download a free program called "systool". Once you've got it, you can use it to underclock if you want, or overclock though I wouldn't recommend it. Under CPU Overclocking, choose the nforce4 as the chipset, then hit read. Mine then shows the fsb speed to be about 193.75. Don't know why it does this when doing a read, but you can then increase the fsb to close to 200 for stock speeds. You can drop it a bit and it will lower your temps.
Then, under AMD64 Cool&Quiet, you can undervolt the cpu a little. This drops the temps also by supplying a little less voltage to the cpu. First set performance to "max performance" in NHC, so the cpu locks at full speed. Then hit "read" under systool's "AMD64 Cool&Quiet" heading. When on max, I get 12x, and 1.450 volts. I then lower the voltage to 1.425, and click write. This keeps my temps at 80-82 degrees max instead of 83-85. I tried 1.400 volts for lower temps, but it freezes up the computer after gaming for a while.
Undervolting is like overclocking. Some processors will tolerate it quite a bit, others won't.
When done gaming, I use NHC to go back to "dynamic switching", and it clocks down again and returns to normal settings. Unfortunately I haven't figured out how to save the profile under systool, so for each gaming session, I use NHC to go to max performance, then manually undervolt as described above. This allows stable full performance at stock speeds with temps that don't go over 82 degrees for me.