I have a ASUS M4A785D-M Pro. I've checked Asus website which doesn't officially support the 970. They list up to a 965. As I understand it the 955, 965, 970, 975 etc are just higher clocks of the same chip. Will the 970 therefore work with this board? I've searched Google and all I can find is that someone asked Asus but they didn't want to be tied down to confirming that the 970 would be okay and refer back to their website.
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They didn't bother to update the CPU list, it works. I don't know if they have a 140W version of that CPU but the 125W should be fine.
Make sure you have the latest BIOS and it will work no problem.