Hi all. This is my 1st post in macrumors. i had checked my iMac aluminum and glass and specs is descript same as here (http://guides.macrumors.com/iMac_(Intel)) which specs is Rev.C low-end 20" . my iMac using Intel "Core 2 Duo" processor (T7300). Now, i want to upgrade it but i don't know what most faster cpu that i can replace. Can anyone tell me?