[Bf-cycles] cycles render incompatibility

[Geo A]

Hello,

Im using the cycles render engine, however im having a compatibility problem as it can't use my GPU and the rendering process takes too long through the CPU only. Im wondering if there's something that can be done to solve this. 

The only thing that appears under File>User Preferences>System>Compute Device is the CPU option.

My graphic card is the following:

SAPPHIRE RADEON HD7870 GHZ EDITION 2GB DDR5 PCI-E RETAIL

I hope there's some way to fix it! 
Thank you!
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