Greetingz everyone, 
I got an Asus P5Q Turbo installed into my rig 2 days ago.
>>>ASUS P5Q TURBO

Nice board OC'ing my E7400, with its 8-phase power design, pretty alright HSF on the NB and on the mosfet, a p45 chipset, I'm more confident to apply the OC config. of 3.8ghz/4ghz for 24/7 usage compared to my previously owned P5QL Pro(which seems to me is an entry level OC board) in which I wasn't confident enough regarding of how it will affect the life longevity of my OC'ed E7400 for 24/7 usage, when using that board.

Anyways is/are there any P5Q Turbo user(s) here? 
Hope you guys can share with your experience with this board 

I gotta say, the TurboV feature can be pretty handy when you want to fine tune(tweaking an increment or two)the voltage in real-time, then when I'm satisfied with the tweaking I can restart the comp and set the value in the BIOS. I only recommend TuborV for fine tuning(finishing touch) though...full-time OC activity/operation only done in BIOS   

More details:

With this board, I manage to OC the E7400 @ 3.8ghz with 1.295v (cpu-z) with most of the other voltage mod to Auto or default settting (Asus specs),
yep, not that thrilling of an OC experience....but OC'ing the proc to 4ghz is a different ball game bcoz it gives me a hard time...manage to stabilizes it @ 400fsb x 10 @ 1.4v, which is an unsatisfactory result bcoz I bump the vcore on an unhealthy level(above 1.3625) for a 45nm chip...
ATM I'm eager to figure out other methods to achieve the magical 4ghz but maintaining the vcore well below 1.3625v, or least not more than 1.39v...

Nice motherboard btw bro   Beautiful heatsink.
You know, OC'ing is a journey or a path once you got hooked up, you'll be addicted and will spend hours in pursuing perfection in terms of getting the most out of your system.
So as I have summed up, you should start fully educate yourself in Overclocking since it consist of few 'chapters' in which you need to master and countless knowledge which are prominent to acquire first before fiddling around with the TurboV. 
Good news, there's plentiful of sifus on LY.net and its easy to start-off...but the challenging part is that little-lest of tweaking when you reach the OC limit of your system.

Other reasons people overclock is that for example, you can turn a2.8GHz RM400~ish processor (e.g. E7400) into a 3.6Ghz plus RM600+~ish processor 

As for the TurboV (my new favourite toy) is only for tweaking bro, you should overclock full-time in the bios