Get a SSD, makes a world of difference.
You already have a rather potent system, it may not benchmark at the top of the charts in games, but it doesn't lack the power for just about any task you can throw at it.
Find your noise sources and "kill" them.
My guess at noise source:
Reduce the number of fans and ensure you have some high quality fans. (Can't help promoting Noctua fans, they are ugly as hell but they barely make a whisper.)
I am guessing your PSU is the NZXT PP800, not exactly a efficient unit and dual fan PSU's are rarely silent.
The lone 212 fan will run at high RPM if you have that 8150 OC'ed, try adding a fan to have a push pull setup on the heatsink, it should allow the fans to run at a little lower RPM.
Originally Posted by ITAngel
I just want to build a different system that is all.
and I have someone interested in the system at the moment.
Wait what???? You are selling your system and hoping you can beat it with a $600 setup.
Your current system has a nice motherboard, OK CPU and GPU etc. etc.
That motherboard still goes for almost $200 and I don't think there are any better models for AM3+ out there.
The only thing from AMD that really beats the 8150 is the 8320 when overclocked and the 8350, both are close to the $200 mark.
On top of this, you will have to throw more than $200 after a GPU that will beat the 6950 you already have.
In total upgrading your current motherboard, CPU and GPU to something from AMD that is actually faster will total more than $600 and we still haven't looked at the rest of the component.
You can replace the motherboard and CPU with something from intel and get better CPU performance in games, but I doubt the FX8150 is holding your HD6950 back.