I'm really liking bios ver. 5.10, fixed a few oc'ing quirks on my 1700 like having to use a vcore offset with over 1.30V or it'll lock it to 1550MHz. Now I can just set a fixed voltage of 1.375V and it runs just fine @ 4.0GHz.
It also helped with how the CPU handles sub-zero temps. With ver. 3.20 the CPU would force stock settings even though there was an OC set. Now it handles it no problem, aside from the IMC of course.
This is with some -15C coolant.