how can i know that my psu can handle a GTX 650 2GB DDR5???

sam002fc

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Apr 7, 2014
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HELLO,
i am planning to upgrade my gpu my specs are
cpu; intel core i3 2120@ 3.30 ghz
ram; 6gb ddr3 1333 mhz
Gpu ; sapphire radeon hd 6570 2gb ddr3 ( planning to sell it)
motherboard: ASUS P8 H61MLX3 R2.0 ( with pci ex 3.0 x16)
psu: stock ATX 400 watt ( i am not sure about the connectors)

so, will i be able to power up a GTX 650 2GB DDR5 with these specs???? plz answer quickly