4 pin and 8 pin CPU connectors

Altair44

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I am planning to buy this mobo for my fx-4300.

http://www.flipkart.com/gigabyte-ga-970a-ds3p-motherboard/p/itmdt9h6w2wsfg2c?pid=MBDDT9H6W2WSFG2C

One thing i noticed while watching youtube unboxing video, that it has a 8-pin cpu power connector port. I was going to buy this power supply(below), but now i am confused as i want to try overclocking the fx-4300 (first time overclocker) after i assemble the pc. It says on site that it has single 4 pin cpu connector.

http://www.flipkart.com/seasonic-ss400bt-psu/p/itmdfbeqezgmgggf?pid=PSUDFBEPQB2ZCCMS&srno=b_1&ref=c97c7bc8-9103-403f-a8ce-a5b1667607d9

So, my questions are,
1- If anyone have that PSU i mentioned above, can please confirm that it have a 8-pin connector or not?
2- Will i run into trouble if i buy the ss400BT psu for that motherboard?
3- Is it must required to buy this psu( http://www.flipkart.com/seasonic-eco-500-watts-psu/p/itmddqq8dzqzkzdy?pid=PSUDDQPPZZYAGRWT), which on the site says have "1 CPU Connector with ATX 12v(4 pin) + EPS 12v(8 pin)"?
4- Can a power supply with 2x 12v Rails(4 pin each) work on those 8 slots of mobo? Like this one (http://www.flipkart.com/antec-vp450p-450-watts-psu/p/itmda3ncpuga3hpu?pid=PSUDA3NCT4Z4SKKR&otracker=from-search&srno=t_2&query=antec&ref=aeaf819d-efe5-4de4-8e6d-f3e0b657cce4).
5- Suppose a power supply have 18 Amps on each rail. Does that mean if i use them both result in total 36 Amps?(If the 4th question is valid)
5- Is there going to be any trouble if i overclock the cpu while the graphics card is on the PCIe slot or that doesnot matter? (I have a msi r7 250 1gb ddr5 and it says on the papers that there should be minimum 20 Amps on the +12v Rail). Why i am asking this, is because they both use the same power source.

As you have guessed, i lack knowledge about these stuff but i am eager to learn. Sorry if these are noobish questions and Thank You!
 

Altair44

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Can i use 2x12v rails, 4 pin each, on those 8 slots?
 

Altair44

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That one is like 1500 INR more than this http://www.flipkart.com/seasonic-eco-500-watts-psu/p/itmddqq8dzqzkzdy?pid=PSUDDQPPZZYAGRWT&otracker=from-search&srno=t_3&query=seasonic&ref=5bc239b7-060e-4d69-974f-df180bee36eb. And it has only 6 amps more on the 12v and rest is nearly same. I can save some money here :D