Answer #1: 52C on your CPU for idle seems warm, but I'm guessing that's fine. How long have you had the AF64 running?
Answer #2: That's fine, but I'm pretty sure you could have gotten to about 10k+ for the score.
Answer #3: A huge performance increase if you increase the FSB on your CPU. Well OCing the CPU pretty much OC's your RAM as well. And for the VGA, it's just to get a better fps and faster response.