Corsair Bronze CX500 500W Power Supply – £39.95 at Amazon

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Corsair engineering and quality control.
Plentiful connectors and long cables.
80 PLUS Bronze Certified efficiency.
Supports the latest ATX12V v2.3 standard and is backward compatible with ATX12V 2.2 and ATX12V 2.01 systems
Over-voltage and over-power protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components