I have MSI 970A SLI Krait Edition motherboard and Sapphire HD5830 Xtreme graphic card. Can I use Sapphire HD6850 using crossfire?
The HD 5000 and HD 6000 series have recently been declared legacy, so you really should look at upgrading to a new R9 200 or 300 series card.
No you cannot, as the cards are not compatible for CrossFire.
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