a good power supply with 500+watt

Solution
What are your system specs? Very few single GPU systems need >450W

PCPartPicker part list / Price breakdown by merchant

Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($39.99 @ Amazon)
Total: $39.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-07-27 17:16 EDT-0400

If you're ok with rebates, the S12II 520W is a quality option, albeit dated at this point.

PCPartPicker part list / Price breakdown by merchant

Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply ($34.98 @ Newegg)
Total: $34.98
Prices include shipping, taxes, and discounts when...

Barty1884

Retired Moderator
What are your system specs? Very few single GPU systems need >450W

PCPartPicker part list / Price breakdown by merchant

Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($39.99 @ Amazon)
Total: $39.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-07-27 17:16 EDT-0400

If you're ok with rebates, the S12II 520W is a quality option, albeit dated at this point.

PCPartPicker part list / Price breakdown by merchant

Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply ($34.98 @ Newegg)
Total: $34.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-07-27 17:18 EDT-0400
 
Solution