![]() ![]() The advantage of using an adaptor is that if you do burn out a pin it's a pin on an adaptor rather than a pin on the motherboard which is easier to deal with. The adaptors you mention aren't strictly needed, you can just plug the connector straight in. In a machine with SLI/Crossfire using a 20 pin PSU would be a very dumb idea.Extra-High Voltage: greater than 230 kV but less than 1000 kV. In a machine with a single graphics card it's borderline, a 20 pin PSU should be ok if all the parts are high quality and in good condition but there is a real risk of burnout. High Voltage: greater than 100 kV and equal to or less than 230 kV. ![]() In a machine without a graphics card a 20 pin PSU will almost certainly be fine.They use cheap copies which often can't handle the current. Unfortunately however PC vendors don't tend to use genuine molex connectors. The newer mini fit HCS (which is pin compatible but higher rated and is reccommended by the ATX12V 2.0 standard) is rated a little bit higher. IIRC a PCIe graphics card is allowed to draw up to 75W from the motherboard (beyond that they use a supplementry connnection to the power supply).Īdd a PCIe graphics card to the various loads on the motherboard and you are up to arround 100W or so.Ī mini fit JR is supposed to be good for 9A. The CPU has it's own 12V connector so we don't have to worry about that but we do have to worry about general motherboard loads and any expansion cards. The 20 pin ATX power connector only has one 12V pin, the 24 pin connector has two. Unfortunately the ATX power connector was designed in the days when 3.3V and 5V dominated. The modern low voltage (often less than 1V) electronics can only practically be supplied by point of load converters and it's more efficient to run those power converters off a 12V input than a 5V input. There has been (which was starting when this question was written but has become even more so in the years since) a trend in PC hardware design away from 3.3V and 5V and towards 12V. I do not know offhand what hardware uses the +12V, but that would be my main stability concern when using the splitter attachment. which means that they need to share the additional load.įrom having a look at the Wikipedia page you reference, it looks like the standard 20 pins have a decent number of +5V and +3.3V lines already, but there is only one +12V line, which gets duplicated by the extra 4 pins. If you use the adapter you suggest it will copy one or more of the existing lines to supply these pins. Note that what the 24-pin supply does, is add one additional supply line of +3.3V, +5V and +12V each. if you have any kind of modern graphics card installed I would probably not even consider going there. Something with not too much memory, ideally no more than 1 hard-disk, and probably not too high-end a dual-core processor. I have no exact information to provide you here, but my gut feel would be that you should only consider trying this if you have a relatively low-power system on the motherboard. ![]()
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