afaik, the heat generated by a cpu is dependent only on it's core clock speed and voltage. so if you lower the multiplier and raise the fsb and end up with the same core speed, you shouldn't have an increase in temps.
but if i'm wrong, then the fsb shouldn't increase the heat output by much.
I don't really think the burn in program from sandra is that great. prime95 is well known for its stability testing ability and I like to run it overnight at least. You can get it here
What revision of the A7N8X is your board? I ask this because the earlier versions would often have problems reaching 200fsb. And even with the later revisions, it's luck of the draw. It should be printed on your motherboard.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS