Can this be UPGRADED?!

Need to know your Motherboard make and model first

Motherboard:
Manufacturer: ASUSTeK Computer INC.
Model: M2N-MX SE Plus
Chipset: Nvidia (MCP61) Rev. A3
Southbridge: Nvidia (MCP61) Rev. A2
LPCIO: ITE (IT8712)

Thank you, i don't know if it's up gradable from this.

Best Phenom it will support is this one:

Phenom X4 9450 (HD9450ODJ4BGH),2.1GHz,65W,rev.B3,SocketAM2+,Quad-Core

No it will not support the Phenom II x4 965. This board only supports 65w CPUs. The Phenom II CPUs come in 95w and 125w versions so the answer is no. It is a very old motherboard and only supports max 4GB of DDR2 RAM. The most powerful CPU it will support is the Phenom X4 9450 which is a speed crippled CPU (all first generation Phenom's were speed crippled by the TLB bug even after they were "fixed").

My advice is to wait awhile after you have saved up enough money and buy a brand new system.

There is no upgrade path for that motherboard, unfortunately. The only thing you can do is save up for a system replacement.

How is the Phenom X4 9450? is it still viable enought to run high end games? i'm on a low budget saving for a new system is kind of harsh.

Can anyone give me a site that have AMD PHENOM X4 9450e - 2.1 GHz AM2+ 65W Quad-Core HD9450ODJ4BGH at a reasonable price? thank you so much guys, Really, really appreciate for your help!