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The HD 6870 is legacy hardware and will not receive any driver updates, and Crossfire HD 6870s are outmatched 25% on paper (higher in practice due to non linear scaling) by even the $100 RX 460, and don't even match the power of the R7 260. You would be well advised to upgrade your graphics hardware.
It cannot be so bad. Are you sure your Crossfire bridge is OK?
1.Fully update your OS,BIOS and install latest chipset and ME driver.For your hardware win8.1/win10(RS1) is highly recommended
Agree with black_zion.
Recommended card for the game is 7950(more powerful than 2x6870), so rx470 is similar.