How much of a performance increase will I see with these upgrades?

My current build is..

Amd Athlon x2 250 3.0ghz

4gb ram

480w Generic psu 36a combined on 2 12v rails

I will be going to

Phenom x6 1090t

12gb ram

Corsair 750w psu with 60a on a single 12v rail.

(my vid card is a Gtx 460, and my OS is Windows 7 64 bit)
 
i would recommend just getting 8gb of ram but yes that is a big jump in cpu power. You will notice a difference especially in games going from a duel core to even a quad core but the 1090t is a great cpu the 1100 t is only slightly more if you want to opt for it.
 
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