hi i have an Radeon HD 6770 1gb and would like to add an another card ie 4gb ,
to my my empty pci express slot what cards will be comparable but not breaking the bank
There is no benefit to do what you are looking for.
The Radeon 6770 has reached End of Life and there is no further driver development planned for it.
If you add a current generation card, you will run into issues because you need to run the same driver for both cards and that is impossible with the 6770.
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