How could i know if my new psu cables are similar to my motherboard?

Solution
You should get 650watt psu.

All PSUs and motherboards use the standard 24pin connector, the only connector to worry about is the CPU, that psu (and assuming its 650 watt equiviant) has an 8pin cpu connector which will work for 4pin and 8pin cpu connectors.
You should get 650watt psu.

All PSUs and motherboards use the standard 24pin connector, the only connector to worry about is the CPU, that psu (and assuming its 650 watt equiviant) has an 8pin cpu connector which will work for 4pin and 8pin cpu connectors.
 
Solution