Gateway 4300-05 Question

Motherboard is a
Foxconn (Bengal) RS780 motherboard
SPECS
Processor1 supported by mother board
AMD Phenom™ X4 quad-core processor
AMD Phenom™ X3 triple-core processor
AMD Athlon™ X2 dual-core processor
AMD Athlon™ processor
AMD Sempron™ processor Chipset AMD 780G Chipset Memory1 Up to 8 GB of DDR2 800 MHz SDRAM (dual-channel support on four DIMMs) .
I currently have the AMD Athlon X2 dual-core processor

The gateway fx series uses the same motherboard and it uses the following processor
FProcessor AMD Phenom X4 quad-core Model 9750
Operating Mode 32 Bit Yes Operating Mode 64 Bit Yes Revision B3 Clock Speed 2.4 GHz Core Speed 2400 MHz Voltages 1.20 / 1.25 / 1.30 V Max Temps 61° C Wattage 125 W L1 Cache Size 128 KB L1 Cache Count 4 L2 Cache Size 512 KB L2 Cache Count 4 L3 Cache Size 2048 KB CMOS 65 nm SOI Socket AM2+

so my question is can i upgrade my processor to amd quad core?, and if so what ones can i choose from? Is this processor able to use AM3 CPUS?

thank you for your help
Thanks, William