Overclocking i5 3550 + MSI Z77A-G43

Hello everyone,
I just bought a new gaming rig and I would like to do some slight overclocking (4.0 - 4.2GHz) to my new Ivy Bridge i5 3550 with just changing Multipliers and maybe slightly the BLCK to 102.5 instead of the default 100. I have NO knowledge about Voltage changing so that's my weak spot, and when I did an OC to 3.7GHz (just changing to x37) my system worked but a little unstable, sometimes rebooting itself or having a hard time to boot the OS or even the BIOS... I was told this is because of low Voltage problems but I think it's weird because I set it to AUTO. Also there are some additional settings in the BIOS which I think I should disable or modify such as those "power saving" thinigs, etc...

My specs are:

CPU:::::::::::::::::: Intel Core i5 3550
Motherboard:::: MSI Z77A-G43
Graphics:::::::::: EVGA NVIDIA GeForce GTX 460 SE 1GB
RAM::::::::::::::::: G.Skill DDR3 2x2GB 1600Mhz PC3-12800 RipjawsX
Hard Drive:::::::: Seagate Barracuda 250GB Sata2 7200rpm
Hard Drive:::::::: Samsung F1 320GB Sata2 7200rpm
Optical Drive:::: Samsung Super WriteMaster SH-S223
Cooling::::::::::::: Thermaltake 120mm Blue LED Fan (x4)
Power Supply:::: Antec 520W Neo Eco 520C 80PLUS
Case:::::::::::::::: Thermaltake Commander MS-I Snow Edition
OS:::::::::::::::::::: Windows 7 Ultimate x64
Monitor::::::::::::: Sony Bravia LED 32EX525
Keyboard::::::::: Maxell LED Retroilluminated Keyboard
Mouse:::::::::::::: A4Tech X7-F3

Any help would be extremely appreciated and please don't post comments like "non-K versions aren't for overclocking so don't do it" because I really want to do it and my MB allows me to, so why not

THANKS!

PS: I'll upload some images of my BIOS configuration if it helps ^^

It's not fully locked, it's unlocked from x16 to x41 i dont know why... I want to overclock it but my voltage settings are like: AUTO, +0.02000, +0.04000, +0.060000

What does that mean and how to I set that to configure my voltages? :S

Well, I'm at 3.7GHz right now setting the multiplier to x37, and I also have Intel Turbo Boost activated because i THOUGHT that maybe with that it could reach 4.1GHz, but it didn't or CPU-Z doesn't detect it... I just left the Voltages on AUTO, and I tried to set the multiplier on x40 and set the voltage to +0.1 and it didn't work either, I think it's just not allowed to SET the multiplier so high, but I've seen people reach 4.1GHz doing something with the Turbo Boost, I still don't know how... I'm using Stock Cooling for the CPU but it NEVER reaches 50ºC even overclocked to 3.7GHz when on full load playing any modern games like Crysis, Black Ops, MW3, etc, so heat isn't a problem because of my cold weather ^^

Here is the CPU-Z Validation: http://valid.canardpc.com/show_oc.php?id=2438133 (I have both my CPU and GPU Overclocked )

THANKS!!!

OK! I found something where I made progress... I set the Multipliers to x41 but this time I left ENABLED Turbo Boost, and it worked perfectly, with Voltages at AUTO... I'm having 1.16V and 3.9GHz not 4.1GHz, even when I set the multiplier to x41, it's acting as a x39... I went to the MSI Control Center and it's funny, because each core is set to run at x41 and they are all running at x39. Anyway it's progress because now I'm at 3.9GHz stable and I'm closer to my 4.1GHz goal...

Here's the new CPU-Z Validation for this new OC: http://valid.canardpc.com/show_oc.php?id=2438156