Macbook Pro 15" not the same?

I just bought a Macbook pro 15" 2.2 ghz, and I was wondering why I got the "AMD Radeon HD 6750M with 512MB GDDR5 memory" Instead of the "AMD Radeon HD 6770M with 1GB GDDR5 memory"? I read forums and saw youtube videos where people would have the 2.2ghz and have the 1GB GDDR5 memory instead of the 512MB GDDR5. I have the late 2011, but some people with the late 2011 2.2ghz version have 1GB but I'm stuck with the 512MB. Is there a way I can upgrade this to a 1GB? Thanks.

Phameezy wrote:
Is there a way I can upgrade this to a 1GB? Thanks.
Sorry, no. If within 14 days of purchase, you can return for a refund & purchase this model:
http://store.apple.com/us/configure/MD322LL/A?
Otherwise, you own it.

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