Can I upgrade my graphics card on an old hackintosh?

I've got an older hackintosh built off the tonymac guide. Runs like an absolute dream. Its getting a bit dated now though. What are the chances I can upgrade the graphics card without breaking everything?

Current Specs:

GTX 660 ti 2048mb
Intel Core i7-3770K Ivy Bridge Quad-Core 3.5GHz
GIGABYTE GA-Z77X-UP5 TH LGA 1155 Intel Z77

submitted by /u/jonny360
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