AMD Radeon HD 6970M with 2GB GDDR5 available for upgrade?

Question

I bought my iMac in store and it came with AMD Radeon HD 6970M with 1GB. Then I saw that the 2GB version of this card is availble online only. I want the 2GB card bad. I see that apple sells video cards for older verions of the iMac. Does anyone know if there is a way to order the 2GB card for the mid-2011 i7 iMac?

Answer 1

Changing out the Radeon 6970M 1GB for a 2GB card will not void the warranty.  Changing the cpu will.
Really.
Have you read the warranty? Specifically, check (g) which appears to be applicable to a different graphics card (as well as (f)  and (d) which may also be applicable):
(This is an excerpt from an iMac hardware warranty for the US):
This warranty does not apply: (a) to consumable parts, such as batteries, unless failure has occurred due to a defect in materials or workmanship; (b) to cosmetic damage, including but not limited to scratches, dents and broken plastic on ports; (c) to damage caused by use with another product; (d) to damage caused by accident, abuse, misuse, liquid contact, fire, earthquake or other external cause; (e) to damage caused by operating the Apple Product outside Apple’s published guidelines; (f) to damage caused by service (including upgrades and expansions) performed by anyone who is not a representative of Apple or an Apple Authorized Service Provider (“AASP”); (g) to an Apple Product that has been modified to alter functionality or capability without the written permission of Apple; (h) to defects caused by normal wear and tear or otherwise due to the normal aging of the Apple Product, or if any serial number has been removed or defaced from the Apple Product.
It is irrelevant whether or not I've done a teardown. What is important is that the OP now has the information necessary to make an informed decision. With that, I am done here.