Considering the switch to Intel - Need mobo selection assistance

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atheus
Interesting question — I am by no means an expert on this subject, so I did some google-fu and can at least share what I found. It sounds like the 4 pin ATX CPU power connector is rated for 192 watts, while the 8 pin connector is raed for 336 watts. I sincerely doubt that you could get a 4790k to draw as much as 192 watts, but what will happen as you draw more current is the wires will heat up under load, which will increase the resistance, which will decrease the efficiency. By spreading the power out over 8 wires, the wires will stay cooler and maximally efficient.

My guess is the 8 pin connectors were originally intended for multi-socket boards, and got adopted by high end boards for overclocking as a sort of 'may-as-well' type of...
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atheus

atheus

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Interesting question — I am by no means an expert on this subject, so I did some google-fu and can at least share what I found. It sounds like the 4 pin ATX CPU power connector is rated for 192 watts, while the 8 pin connector is raed for 336 watts. I sincerely doubt that you could get a 4790k to draw as much as 192 watts, but what will happen as you draw more current is the wires will heat up under load, which will increase the resistance, which will decrease the efficiency. By spreading the power out over 8 wires, the wires will stay cooler and maximally efficient.

My guess is the 8 pin connectors were originally intended for multi-socket boards, and got adopted by high end boards for overclocking as a sort of 'may-as-well' type of inclusion.

That said, I certainly don't have enough experience in the area to tell you in concrete numbers how much of a difference it will make to your overclocking experience using just the 4 pin connector. I would suspect that for moderate < 1.31 vcore overclocking it won't matter all that much, but that's just my analysis of the little info I was able to find on the subject in a few minutes of searching.

You could read
http://www.tomshardware.com/forum/296946-28-power-connector#2830978
http://www.enthusiastpc.net/articles/00002/2.aspx
 
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