Early impressions of bios 1005 for the C4F....
I've only tested it for a couple hours, but since no one has said anything I thought I'd offer some observations.

I'm going to go out on a limb here, and say don't worry about upgrading!
So far it seems to be much more OC friendly than 0905 and after 2 hours I don't regret flashing it!

Here are a few things I've found so far....

The Good:
1) The floating HtRef is virtually gone!
I've seen a little fluctuation when TurboCore is active, but it's a huge improvement/rare and barely noticeable...

2) Turning LLC on for the IMC no longer results in crazy voltage swings.
The most I've seen it OV the IMC is ~.02v.... This is MUCH better than the .3v swings I saw using 0905 (that was scary!) this is useful and in fact, may be a little weak...

The Bad:
I have a 1055T so using TurboUnlocker comes in very handy for me. The only negatives I have to say about the newest bios relates to Turbo.

1) Activating Turbo appears to work (shows up in the status box), but has very little effect on lightly threaded apps...
It says it's working, but benches don't show an improvement by having it on.

2) With Turbo and LLC both on it still OV's the CPU Vcore quite a bit (~.13v)...
I have good water cooling, so I'm not really worried about it, but I could see where it might be a problem for folks on air.

2a) I thought they were going to include a %value for LLC overvolt? That would have been nice, maybe I'm missing something...

Mixed:
I can't swear to this yet, but it seems like the board does a much better job of picking up the Memory's SPD chip.
This is all well and good, but setting AUTO for my Corsair GT 2000 CL8's (I was trying to take mem out of the equation ) resulted in a failure to POST...
Just keep this in mind if you have high performance RAM and auto causes POST problems.
Manually setting the mem frequency to 1600 fixed the problem, I'll tweak mem later...

BTW: the gear in my sig is accurate for what I'm using.