How much of an upgrade will this be?

I am going to be upgrading my girlfriends computer for light gaming. But now this is her current specs.

AMD Athlon XP @ 1.3 GHZ

Nvidia Geforce 2 MX 400 32MB

512 MB SDRam

20 GB HDD

150 Watt PSU

LG super-mult DVD burner 20x

windows XP starter edition SP2

LG flatronic 15 inch w/ vga and DVI monitor

Now I am thinking of get this for her

AMD Phenom 9500 2.2 GHZ

ASUS 780g mATX

2 GB DDR2

WD 250 GB SATA HDD

thermal take 430 watt PSU

Visiontek ATI Radeon HD 2600pro 512 GDDR3

So how much of an upgrade will this be?

she like to play games like the sims and sim city, ceasar 2 Fifa soccer

I am going to be upgrading my girlfriends computer for light gaming. But now this is her current specs.

AMD Athlon XP @ 1.3 GHZ

Nvidia Geforce 2 MX 400 32MB

512 MB SDRam

20 GB HDD

150 Watt PSU

LG super-mult DVD burner 20x

windows XP starter edition SP2

LG flatronic 15 inch w/ vga and DVI monitor

Now I am thinking of get this for her

AMD Phenom 9500 2.2 GHZ

ASUS 780g mATX

2 GB DDR2

WD 250 GB SATA HDD

thermal take 430 watt PSU

Visiontek ATI Radeon HD 2600pro 512 GDDR3

So how much of an upgrade will this be?

she like to play games like the sims and sim city, ceasar 2 Fifa soccer