Better option for A10-5770, Radeon HD 6670 2gb in DUal mode or 7750 1gb?

Hi, I am gaming on a budget and this is the PC I currently have.

AMD A10-5700 3.4ghz
512MB AMD Radeon HD 7660D
8gb Ram
450W power supply
Windows 8

I am looking to get a dedicated graphics card. Could you tell me which would perform better,

Radeon HD 6670 2gb in Dual graphics mode or,

Radeon HD 7750 1gb?

Thanks for your help.
2 answers Last reply
More about better option 5770 radeon 6670 dual mode 7750
  1. i willl go with 7750
  2. Could you tell me why? I don't think the 7750 is supported in dual mode so will it perform better on its own than the others in tandem?

    Thanks.
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