I'll put it like this. You don't "need" a new board. The board you have WILL work. But you don't "need" to change the oil in your card either. The old oil will work to lubricate the engine, until it doesn't. Same thing. That board will work, until it doesn't. And hopefully when that happens it's only the board and not the board AND CPU that fail.
That board was designed to be used with FX 4 and FX 6 core chips, not FX 8 core chips that have a much higher
Thermal design power and create tremendous and thermal load on the motherboards VRM's as discussed in this article which I recommend you read:
http://www.overclock.net/a/about-vrms-mosfets-motherboard-safety-with-high-tdp-processors