Yesterday I bought a second Radeon R9 290 for CrossFire. Today I tried it out. I am appalled with the current state of CrossFire and tomorrow I am buying a single-GPU card
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Newegg] PowerColor Radeon R9 270 2GB = $90 AR FS (beats a PlayStation 4 ;)) | AnandTech Forums: Technology, Hardware, Software, and Deals
Test System and Benchmarks - Benchmarked - Assassin's Creed: Unity