Processor upgrade

[Exileee]

just wanted to know if i would need to reformat my computer if i want to change the processor
my pc is: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02155464&cc=ad&dlc=en&lc=en&jumpid=reg_r1002_usen_c-001_title_r0003#N210

upgrading to: AMD Phenom II X4 980

my pc is pretty much stock just changed the powersupp to a 550w and the videocard to a GTX 460 V2
also wanted to know if that processor will be a big upgrade for my pc.

i know the pc is outdated all i do game on it i just dont feel like buying a whole new pc at the moment.

 

[rezervesizeja]

Not a huge difference but you'll feel it. And you can probably put in the new cpu and it'll work like a charm. No need for OS reinstall.

 

[Exileee]

what do i need to update to see a big fps difference then?