1. Yes with the right bios version.
2. One is .65 nm; am3 is .45 nm. Select according to price and budget. Overclocking is still not a guarantee.
3. No. Select according to your primary usage. For example, I passed on the 710 which was only $49.99 last week at Fry's; it's too much cpu for surfing the net, and I was too busy to get to the store.