Looks fine. Wah, 1.45v for OC?

try asking at overclocker united~~there are lots of shifu there
to me, my previous generation i7 is abt the same temp as u, so, no worry dude~~~

u can try decrease ur vcore to as low as u can, just make sure u pass the prime95 test, but most of the overclocker use LinX for 20 runs to test the system

Don't need to compare AMD or Intel here. AMD have very high VCore to begin with. They surely need higher VCore to have better OCing. But this doesn't mean they've very high temperature and can't be OC much.

And, yes VCore of 1.45V in the BIOS is too much.
I suggest you to do more researches before you spoiled your system.

No reason.
Every chip performs different.

Do you get more 6870 CFX performance by OCing? If the boost is little then you don't need to overclock.

Not to say that you don't need oc. You can oc later when you actually need extra performance.

80C+ is high. Not recommended for long term use. I suggest you OC to 4Ghz to 4.5Ghz with lower voltage first.

For daily usage mode (stability and longivity), most people recommend running prime95 for 2 hrs (or 4 pass of Linx) without error, maintain temperature of between 65c-70c, using Vcore of less than 1.35v-1.4v.

Don't confused with high Ghz achieved with high temperature and Vcore during OC as suitable setting for daily usage. These are for benchmarking and show off to friends.