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Ive heard that my cpu would bottleneck a crossfire with 2 5870s
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MSI 790FX-GD70 AM3 AMD Phenom II 970 Deneb 3.5GHz Quad-Core NZXT Phantom Corsair Vengeance 8GB
GIGABYTE Radeon HD 5870 1GB 256-bit GDDR5/ Mushkin Enhanced Callisto 60GB SSD/ SB 1TB 7200 RPM
Rosewill 802.11b/g/n Wireless-N 2.0/ Corsair Tx 650w/ Sony DVD


I'm currently researching the subject http://www.xbitlabs.com/articles/graphics/display/radeon-hd5870-cpu-scaling_2.html. I imagine my psu would need an upgrade while I'm at it