For a system using a single Radeon R9 280X graphics card AMD specifies a minimum of a 750 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 42 Amps or greater and have at least one 6-pin and one 8-pin PCI Express supplementary power connectors. There are some non-reference design cards that require two 8-pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.
Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
Thermaltake SMART Standard 650W (SP-650P)
• OEM: CWT (Channel Well Technology)
• maximum combined +12 Volt continuous current rating of 52 Amps
• two 6-pin and two (6+2)-pin PCI Express supplementary power connectors
• Modular Output Cables: No
• Official Intel Haswell Compliance: No
• 80 PLUS BRONZE Efficiency Certification
• 3 Year Limited Warranty
Thermaltake SMART M650W (SP-650M)
• OEM: CWT (Channel Well Technology)
• maximum combined +12 Volt continuous current rating of 52 Amps
• two 6-pin and two (6+2)-pin PCI Express supplementary power connectors
• Semi-Modular Output Cables: Yes
• Official Intel Haswell Compliance: No
• 80 PLUS BRONZE Efficiency Certification
• 3 Year Limited Warranty
Either model is more than enough for your intended system configuration.
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