Hi, I wanna know if it's possible to future proof my iMac. I've had it apart a couple times and it looks as if the GPU is removable but I'd like to know if my computer would freak out if it noticed a change of hardware like that. Also would any sandy bridge i7 or i5 fit my base model 21.5" 2011 iMac? It's hard to gauge with apple stuff whether they don't offer an i7 on the base model because it wouldn't work or just because they dont want me to have a powerful base model. The 3.4 i7 will drop in price a **** load soon so if it is possible I'll be putting one of those straight in. Any info is much appreciated.