I purchased a Sapphire Radeon R9 270x 4 gb before I upgraded to a MSI G45 motherboard, which they claim better performance if paired with a MSI graphics card. Is this true, and can I crossfire a MSI Radeon R9 270x with a Sapphire Radeon 270x? If I can, is the proclaimed "performance boost" worth $60 more for the MSI version, or should I buy another Sapphire for $60 less?
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