LanOC Reviews published a review on the RX580 Crossfire Testing
A quote from the article:
So last week AMD launched the 500 series of cards and I had the chance to check out two different RX580 variations. So like always, if I get a pair of cards in and they support Crossfire or SLI I have to see what they are capable of. So as soon as I had my reviews posted I got the XFX and Sapphire cards on the testbench and started seeing what they can do. Like previous multi-card testing articles, this is mostly just me posting up results with less commentary than normal. So get ready to flip through a whole bunch of results.RX580 Crossfire Testing @ LanOC Reviews