Question 1

does this come with all the needed wires to run a pc?

Accepted Answer

This comes with all wires to /power/ a PC. You have all the necessary cables to power your components such as gpu, cpu, mobo, abd drives. This does /not/ contain cables for other uses such as reading a hard drive or peripherals.

Question 2

What's the difference between the classic version and the "2017 new version"?

Accepted Answer

What are the differences?
First under the Efficiency level certifications of power supplies:
STARTING 80%
80 Plus 
80 Plus Bronze  (CX750M)
80 Plus Silver 
80 Plus Gold 
80 Plus Platinum 
80 Plus Titanium
ENDING 90%

The 2017 version these updated items.
German Infineon PFC and SR MOSFETs
Compatibility with current generation CPU's lower power sleep states (C6 and C7)
Thermally Controlled Fan: Silent operation at low and medium loads
Smaller size and lighter weight

If your building a new computer (i5 or i7) 6th,7th or 8th generation system use the 2017 version of the CX750M power supply
The older CX750M PS is for the 4th generation and older. 
Will the old one work on new systems? Sure but not as well with power management.

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