Amd athlon ii x2 4600+ overclocking

sunnk

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i want to overclock my old pc's athlon ii x 2 4600+ because i want to add a good graphics card in it like hd 6770 or hd 6850 i will upgrade my pc after some time no need to tell now to upgrade i just wanna ask that my mobo and cpu fan will be ok to upgrade i read some where that i can download latest bios and after that in my bios overclocking option will appear is that true? so the final is that can i overclock my cpu?

any help will be appericiated thanks.:)

sunnk.:)
 

sunnk

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here is the image of my heatsink fan.

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closer look
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