1 x 4-pin ATX 12V Power connector = ....?
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Posted by MachineMessiah on July 4, 2007, 9:37 pm
Please log in for more thread options I need a new motherboard but my 550 watt power supply doesn't come with an 8 pin connector for the cpu. If the board was 8 pin would the specs say 2 x 4 pin? | |||||||||||||
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Posted by Paul on July 4, 2007, 11:26 pm
Please log in for more thread options If the board has a 2x4 (8 pin connector), it is prepared for high power consumption processors. A 2x2 connector, has two 12V wires, and if you allowed them to carry 6 amps each, that would be 12 amps of capacity. 12V * 12A = 144W. (They are probably capable of a bit more than that, and the 6 amp number is conservative. I'd have to find the connector datasheet again, to verify the real number.) If the 144W of power is converted by a Vcore regulator at 90% efficiency, that is 129.6W of power that the processor can use. Rounding off, that is 130W, which is enough for a high end P4 processor from a previous era. The whole 8 pins are useful, if you were doing an overclocking experiment, and were expecting a lot more power than that to flow. Overclocking a Pentium D 805 to 4GHz, would be an example where a motherboard with a 2x4, and a power supply with a 2x4 connector, might be useful. The power consumed there, is over 200W. Many of the processors people are using now (Core2 Duo or some of the AMD socket AM2 processors), use less power than the 130W number. The Core2 Duo is 65W, or half that. As a result, you can use a 2x2 PSU power connector, on a 2x4 equipped desktop board, without too much danger of the connector melting or anything. For most people, there is nothing to worry about. Only the "rocket scientists" are in danger of melting something (the D 805 people who try to get the same results as the Tomshardware overclocking article). HTH, Paul | |||||||||||||
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> I need a new motherboard but my 550 watt power supply doesn't come with
> an 8 pin connector for the cpu. If the board was 8 pin would the specs
> say 2 x 4 pin?