Choosing a mATX- for overclocking does P4 or 8pin matter?

Okay, I already bought a i5 2500k. I'm going to gut my six year old system with cheapo generic 500w PSU with 4-pin cpu power (P4) to build the new system. When the current PSU dies then I'm going to get a newer one, but not till it dies.

The build is:
i5 2500k
2x 4gb 1600 Corsair Vengence
Radeon 6850

I'm looking at these two cheapest $109 motherboards on Newegg.

AsRock Z77 Pro4-M
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157306

Gigabyte GA-Z77M-D3H
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128541

The Gigabyte has a 4pin CPU power and the AsRock has 8pin.

1) My questions are if I plan to OC the cpu, should the number of pins matter?
2) If I get the AsRock, which of these adapters would be better?
http://www.newegg.com/Product/Product.aspx?Item=N82E16812119267
http://www.newegg.com/Product/Product.aspx?Item=N82E16812200459

One converts a single P4 cable into a 8pin, the other takes a P4+LP4. Does the motherboard actually use that power? otherwise why would they make a adapter that doesn't take additional power, and only converts a P4 to the 8pin?

3) I've heard that both of these companies build quality motherboards, but does "GIGABYTE Ultra Durable 4 Classic" have anything to do with the ability to use P4 instead of 8pin?

4)Assuming that I'm getting a mATX z77 for OC'ing, future upgradability (cpu, not crossfire), and my target is "as inexpensive and as good quality as good judgment allows", with a maximun budget of "well under $175", could I do better or worse in the quality or performance of these MBs?
2 answers Last reply
More about choosing matx overclocking 8pin matter
  1. 1. No. But the quality of the power supply does matter.

    2. An adapter will not help you. No adapter can miraculously increase the amount of power you can draw from a 4 pin cable. My Gigabyte P45 manuals say that you can use a 4 pin CPU power connector with up to a 140 watt TDP CPU.

    3. No. "Ultra Durable" basically means heavier copper in the ground and power planes of the motherboard, solid caps, and some other minor parts changes mostly of interest to the marketing department.

    4. Yes. You could possibly do better - or worse - than these two motherboards. Pointless question as asked. :)
  2. Quote:
    2. An adapter will not help you. No adapter can miraculously increase the amount of power you can draw from a 4 pin cable. My Gigabyte P45 manuals say that you can use a 4 pin CPU power connector with up to a 140 watt TDP CPU.

    Well, the second adapter uses the 4pin cpu cable plus a 4pin molex to make the 8pin cpu, so that option does increase the amount of power right?
    Quote:
    4. Yes. You could possibly do better - or worse - than these two motherboards. Pointless question as asked.

    It was definitely a convoluted question, but I didn't think it was pointless. I can obviously do better by spending more money, but if I can't do worse, then I should definitely think about doing better. Its part of not knowing anything about choosing a motherboard and then resorting to choosing the best named cheap motherboards.

    Since I can't seem to figure out a way to search these forums and because there are almost no reviews out of most of the mATX z77 boards, does anyone have recommendations of good mATX z77 boards @ less than $175 range?

    Which do you think is better? the "AsRock Z77 Pro4-M" or "Gigabyte GA-Z77M-D3H" is better? :p
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