What's the 4 pin 12V connector for on my Athlon XP mobo?
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What's the 4 pin 12V connector for on my Athlon XP mobo?
I've just had to buy a replacement mobo for my Athlon XP system. My previous board did not have this connector. I thought that it was only necessary for Pentium 4's.
The mobo I have just bought is an Abit AN7 NForce 2.
Should I use this connector or not? I remember something in the dark and distant past about ppl not using these for some coil whine reason.
Any thoughts ppl?
Thanks
The mobo I have just bought is an Abit AN7 NForce 2.
Should I use this connector or not? I remember something in the dark and distant past about ppl not using these for some coil whine reason.
Any thoughts ppl?
Thanks
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On Athlon XP boards, its not usually the Processor than needs the 4-pin 12V connector but rather the chipset. USually only nForce2 boards need the connector, in order to power the more powerful chipset.
If your board has one of these connectors you must use it or the board will not POST.
As far as why the CPU's need the extra power: the vcore does not tell the whole story, you must look at the totally Watts drawn by the chip. I forget the exact formula used, but you must multiply the vcore by something else to calculate the power draw of the chip.[/u][/b]
If your board has one of these connectors you must use it or the board will not POST.
As far as why the CPU's need the extra power: the vcore does not tell the whole story, you must look at the totally Watts drawn by the chip. I forget the exact formula used, but you must multiply the vcore by something else to calculate the power draw of the chip.[/u][/b]
The move to the 12V-line was made in version 2.1 of the ATX Specification because:jamesm wrote:Why do CPU's need power from the 12V line now?
3.3.2 Power Input
Power distribution trends are driving a change in the board power input connectors. As processors become
faster and more highly integrated, more current is required. To reduce power distribution loss, board
manufacturers are moving toward 12V power distribution. To facilitate 12V distribution to the processor
voltage regulator, a 2x2 connector will be required on these systems...
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Consider that a processor pulls 100w. If using 5V, this means that 20A would be drawn from the power supply. However, because of the higher voltage, it would only be 8.3A at 12V. Keep in mind that amperes and heat are related. With higher voltage but lower amps, manufacturers can safely use smaller/fewer wires and lower amperage circuitry.
Yes, but there are no increasing power requirements for Socket A processors, since there are no new Socket A processors coming out (Athlon XP's rebadged as Semprons do not count, in my book). So why bother changing from +5V to +12V circuitry for the CPU?
Because ever since the introduction of the Pentium 4, power supplies have been shifting their circuitry towards +12V, away from +5V, for the reasons stated above. Socket A motherboards have been changing not so much to adapt to the new CPUs, as much as to adapt to the new power supplies.
Because ever since the introduction of the Pentium 4, power supplies have been shifting their circuitry towards +12V, away from +5V, for the reasons stated above. Socket A motherboards have been changing not so much to adapt to the new CPUs, as much as to adapt to the new power supplies.