Unparking ROCKS. I'm running a 7970 with an AMD X4 965, Oc'd to about 4ghz. Before unpark; Planetside 2 Max settings = 25fps avg, Crysis 3 Max settings = lol ya right. After Unparking my meager 3 AMD extra cores; Planetside 2 Max = 65fps avg, Crysis 3 Max = 55+ fps avg. Holy Crap? Crysis 3 maxed on an amd quad core with a single vid card pulling 60fps? YEAH! Far Cry 3 was pretty improved as well, can't remember #s, and my BF3 screams anyway so I didn't check, I'm bored of it now anyway.
I've read unparking isn't helpful on most i5s, too bad.
I find regular multitasking (heavy load) gets choppy in the OS, so I unpark and reset to play serious games maxed out at 1080p, if I don't plan on gaming for a bit, i park them and reboot.
The only downside to unparking as far as I know is that you use your cpu more, and everything has a lifespan. But aren't we trying to maximize everything for performance anyway? I've got a no joke air-cooler on the cpu, no heat issues when unparked, It doesn't even notice temp difference. I even forget to OC my 7970 cuz I don't have to.
In the years people have been unparking their cpu's and leaving them that way, the only issue I've ever come across is the guy with the bsod in THIS thread. I tend to forget to repark, hell they aren't parked now, I don't notice.
Unpark children, u can revert to parked if/when u want (i5), and if you need a good program, msg me and I'll find where I got mine, Somewhere in the Planetside 2 forums, there are 2, the better one is indicated in the forums.
EDIT: here's the unparker page http://www.coderbag.com/Programming-C/Disable-CPU-Core-Parking-UtilityEdited by Darkhaze - 4/14/13 at 10:32am