I currently have a, HIS 7850 Fan 2 GB GDDR5 PCI-E DVI/HDMI/2x Mini DP Graphics Card H785F2G2M, in my computer. Unfortunately HIS does not manufacture this card any more, I am looking to crossfire/sli my card, but don't know if manufacturer matters when doing so.
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More aboutmanufacturer crossfire compatibility
You can crossfire cards from two different manufacturers just fine!