I'm surprised nobody....
YOU CANNOT CROSSFIRE R9-270X WITH A R9-290X.
They are based on different architectures. It's been like this since the "non-HD" Radeon days, and it hasn't changed (much) since then.
You can Crossfire a R9-270X with:
- Another R9-270X
- HD 7870 (GHz or non-GHz Edition)
- HD 7850
Why? They are all based on the "Pitcairn" chip used on the HD 7800 series. The R9-270X --> R9-265 are essentially rebraned HD 7800 GPU's with minor updates. Think of it as revision 2.
You can Crossfire a R9-290X with:
- R9-295X2 (The dual-GPU card)
Why? Both use the newer GCN 1.1 architecture "Hawaii" Architecture.
You can Crossfire a R9-280X with:
- Another R9-280X
- HD 7970 (GHz or non-GHz Edition)
- HD 7950 (Boost or non-Boost Edition)
Why? Just like the R9-270X and HD 7870, they use the same chip; the "Tahiti" Core. Again, minor changes....revision 2.
It's been a while since AMD updated this (they don't have a newer version with the R200 series yet), but have a look at this:
FX-8350 @ 4.8GHz // ASUS Crosshair V Formula 990FX // Sapphire Vapor-X HD 7970 + Dual-X HD 7970 // Thermaltake Frio w/ push-pull (using Antec Formula 7 Nano-Diamond + Cooler Master JetFlo fans) // 8GB (2 X 4GB) G.Skill RipJawsX 2133MHz // Corsair TX850 850W // Corsair Force GT 120GB SSD (OS) // Kingston V200+ 120GB SSD // WD Caviar Black 1TB // Windows 7 Ult x64
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