This is my first post here at mac rumors. I have a 2009 base 21.5" imac, still enjoying it and my first mac btw, and i was wondering if i could upgrade the processor and graphic card like to the new 21.5" high end model.
The CPU you cannot because the new one uses different socket (LGA 775 vs 1156). The GPU is theoretically upgradeable but it's very hard because parts cannot be found and there is no confirmation that the EFI will support it. So no, they aren't upgradeable in real life