I don't know about the Athlon 64, but in regard to the 9550 cooling - the additional monitor shouldn't increase the load on the processor substantially but if you're worried about it you can do what I did with mine, go to CompUSA, pick up a $10 chipset cooling kit, and just mount the small 30mm (rough guess) to the heatsink of the 9550. I've got a Gigabyte 9550 card setup like this and it stays nearly cold to the touch even when I'm gaming.
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Halfway to hell and picking up speed.
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