Such v2. You may use various online PC wattage calculators to estimate your requirements. More specifically, if a motherboard requires either 3. Note that to pin adapter cables are totally useless since all the currents are still passing through a pin power supply connector. These adapters actually make things worse because they add extra resistance between PSU and the load causing more voltage drop. It may work if your SATA device does not use 3.
If you use high-end graphics card with an additional 6-pin or 8-pin power header, you may try to use an adapter that converts two 4-pin peripheral cables into a 6-pin PCI Express cable. Finally, an old PSU may cause a start up problem. Upon initial power up it is first kept low.
Conversely, it has to switch to TTL low state when any of positive DC voltages falls below its under voltage threshold, or at least 16 ms after input power has been removed. It has the last four pins on a detachable section that slips out, so you can plug it into an older motherboard see the diagram above.
Just don't plug the remaining 4-pin piece anywhere- it is not compatible with any other circuits! If your PSU happens to have a solid pin connector, you can still try to insert it into pin slot with the last four pins hanging over the edge of the board's connector. Alternatively, you can buy a 24 to 20 pin adapter. To check compatibility of a specific model see Intel's database and selector of tested PSU. A potential problem with using a new PSU with an old computer is today's PSUs usually do not provide minus 5V output they either don't have the white wire going to pin 20 at all, or they leave it not connected inside.
The minus 5V rail was used by ISA cards. If you have an old computer with ISA slots, it will still need this bus. In this case, if you can't find a power supply with such a rail, you can derive it from V by adding a negative linear regulator, such as MC79M Since minus 5V bus can draw up to 0. A 20 pin power cable only fits into one end of a 24 pin motherboard connector so you can't insert it incorrectly.
They added those extra 4 pins for a reason. When you plug a 20 pin cable into a 24 pin connector you're not providing the extra current carrying capacity which may be needed by the motherboard. If your motherboard's current requirements are low enough then it will work properly with only a 20 pin power cabled plugged in. But if the motherboard draws enough current, then you can overheat the 20 pins you're using on the 24 pin connector.
I've seen enough pictures of burned ATX main connectors to assure you that this happens. Note that your 24 pin machine may work fine with a 20 pin power supply until you add a PCI Express card later on down the road. PCI Express cards can draw up to 75 watts through the motherboard connector so adding an expansion card can substantially increase power draw through the main power cable. Lastly, as an aside: If you have an ATX power supply with a 24 pin main cable, it's okay to plug it into a motherboard with a 20 pin connector.
Improve this answer. Stephen Rauch 2, 10 10 gold badges 22 22 silver badges 25 25 bronze badges. There are many motherboards that are not backward compatible with 20 pin psu. Mobo vendor can use these 4 pins to power up pcie clock generator and related stuff, so without these pins pcie may not work. If you are not using a PCI-E card then it's ok to use the 20 pin connector.
If you are using a PCI-E card it's still ok as long as the card has an external power connection and connects directly to the power supply. Compare the pinout charts on this page, 20pin chart is linked to at the top Generally speaking pci-e graphics cards have their own dedicated power connection and it's not from the motherboard but the psu directly.
Further, would be surprised to learn that the organization that specs the ATX connectors, would have made it possible to connect a 20 pin plug to a 24 pin socket, if not safe. The Overflow Blog. New data: Do developers think Web3 will build a better internet? The robots are coming for the boring parts of your job. Featured on Meta. Related 2. Hot Network Questions. Question feed.
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