Phenom 955 vs 1055

Just looking at gaming then the 955 will be faster because of the higher clock speed, plus it is easy to overclock it.

I Agree with rolli59, If i were you, i'd get a bulldozer now because those Phenom is ganna be on the bottom line soon... In few years or so, games ganna utilize/use more cores or more than 4 cores... You get higher clock speed on the FX and up to 4.7GHz on air cooling...

Well i'm not that much into overcloaking. I will probably adjust the ram to 1600 and reduce the multiplier of the cpu since i will run it with a stock cooler at the start.
The Mainboard, cpu, ram and graphics were given/left to me but the Phenom II X2 555 is completly unsatisfying and i am not able to unlock the additional cores. It barely feels faster then my previous Core2Duo E7300@3Ghz.
Is there more to unlocking the cpu cores than checking "unlock cpu cores" in the Mainboard's Bios? It does nothing so I'm assuming there isnt anything to unlock. (Mainboard: Msi 770 C45 )
The reason i want to get a replacement for the X2 555 is that i am not even able to play Battlefield Bad Company 2 at acceptable frame rates at high quality details. ( or even medium details at some point ...)
Switching the graphics card to something more powerful yields the same results, updating drivers didn't do anything and even reinstalling Windows 7 x64 didn't do the trick.
That's why i thought i need something more powerful like a quad core or even a hexa core to get gaming going.

Some numbers: The maximum fps i get at low settings at 1920x1080 at BFBC2 is 42.... Now imagine i try BF3 like this  

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First time I post minus one!
Currently especially for gamers it is advisable to stay away from the FX CPU's, it is not known if their deficiencies are simply software or hardware related.

Alright i bought the Phenom II x4 955 and even without overcloaking i see a vast difference. Almost triple the amout of fps over all settings. I wonder if my X2 555 was broken?

Thanks for the help rolli59!

You are welcome, great to hear you are happy!

Frostbite 1.5/2 engine is one of the few that benefits greatly from more than 2 cores.