Upgrading Video Card in the iMac

I've been very confused by what I have read on so many discussion groups. Is the video card in the 2.8 Mhz, duo core, Intel based iMac upgradeable? I know there is a standard plug in card, MXM, but am not sure if the 2400 ATI card I have in the iMac can be upgraded. I am sure it is a chore to access the innards of the iMac.

YC73, you can familiarize yourself with Apple's policies;Sales and Refund Policy. The link is to the US online store, but the policy is consistent, allowing for local laws, throughout the world.
As you can see from the policy, a built to order iMac is not returnable in the first 14 days, as a standard model would be. It is my understanding that something as simple as a RAM upgrade makes the Mac BTO.
As a BTO, the Mac is subject to the Apple Manufacturer's Warranty. It is repaired or replaced at Apple's discretion. It is reported by other's in the forums with experience, that Apple traditionally replaces a machine if it is repaired three times.
I hope this answers your question.
PS, Forgive Ricktorronto, he may have drank too much Apple Kool Aid recently. Most long time posters are usually more tolerant in their replies.

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