GT-I9100 vs. GT-I9100G: Chipset: Exynos 4210 Dual vs. TI OMAP 4430 GPU: Mali-400MP4 vs. PowerVR SGX540
http://www.gsmarena.com/compare.php3?idPhone1=3621&idPhone2=4327Galaxy S3 GT-I9300 and Galaxy Note 2 GT-N7100 have Exynos/Mali-400 SoCs, like GT-I9100.
http://www.gsmarena.com/samsung_i9300_galaxy_s_iii-4238.php http://www.gsmarena.com/samsung_galaxy_note_ii_n7100-4854.php