I don't know what board you have, but those LLC settings sound like something in a Gigabyte bios. I would back the level off to where it's about what you set vcore in bios when under load. And I give myself a vcore hard line of 1.45v for 24/7 use with my Sandy Bridge chips and usually don't push them that hard for long term use. See if you can back off the vcore to around 1.45v while staying stable at 4.8. And those temps aren't bad by any means, especially running IBT. Also, try stressing with Linpak and P95 and see how the temps are. With SB, IBT won't necessarily give the absolute highest temps. Regardless, 71 C isn't too high for a stress test.