Well you have an option.
You can add a Pci-e based graphics card with the same Gpu range as the A10 Apu has as the video solution.
And activate Apu, Pci-e crossfire mode in the Crimson driver suite.
That's the cheaper option.
Or put your hand in your pockets and buy a very high end Pci-e graphics card in the ATI 300 series range of graphics cards.
If you want to go nutts, then buy a ATI Fury X graphics card. 4096 stream processors
A 300 series card or a Fury by ATI would let you play Battlefront.
Also you should upgrade the system memory to 16GB. Battlefront likes more than 8Gb of system memory.
Apu and Pci-e crossfire.
Is it possible to setup AMD CrossFire™ using an AMD APU and an AMD graphics card?
It is possible to setup a single discrete AMD graphics card in combination with an AMD APU's built-in graphics processor. This setup is referred to as AMD Dual Graphics.
Please be aware that some BIOS options will likely need to be changed in order for this setup to work.
Once you have setup the BIOS options correctly and have verified that the discrete graphics card is compatible with the APU you are using, the option for AMD Dual Graphics will be available in the AMD Catalyst™ Control Center or Crimson Control Center.