As you say, the conductor isn't the only limitation. That is barely more than the rating for a single 16AWG conductor. Otherwise, the supply will have its multiple buses connected together simply by plugging the EPS12V cable(s) into standard EPS12V motherboard connectors. The power supply had better have all of its EPS12V power pins on the same bus (if "bus" means separate, internally regulated 12V sections - normally inside the supply all "buses" of a single voltage eventually go back to the same regulator stage).Again, this is something that has been done on video cards for ages, so there are proven designs out there. 2 alternatives that quickly come to mind are diode(s) between the EPS12V connector and the motherboard 12V bus and the same voltage sense, but this time all of the EPS12V pins are connected together as is done now, or measuring voltage drop across a shunt, like a multimeter does to measure current. This was a simple design idea designed for the minimum amount of changes to motherboard layout and fewest additional components.My point is more to the portion of your statement "I'm not sure why they don't." - I'm not sure either, but there are more than a handful of possibilities. And if it's not a problem, I would strongly prefer they not scare-monger. To be clear, I actually do agree with you - if this is a real problem, supermicro should have solved it in software or hardware. As above, a 4-pin connector plugged into an 8-pin EPS is allowable so long as you don't install a high-wattage CPU. If you take away one of the wires, you may be reducing the total safe power delivery by as much as 50%, not by 25%. ![]() So which pin do you use for sense, with no standard on this? Also, keep in mind on a 4-pin, 2 wires are 12v and 2 wires are ground. Problem being that if you do this, pins 1-4 will be populated on one EPS connector, and pins 5 - 8 populated on the second one. So long as you're using lower-wattage CPUs, this will work fine plugging one 4 pin into one 8-pin EPS, and the other 4 pin into the other 8-pin EPS. ![]() So even though the wiring and connectors should be capable of far more, there is no guarantee that a power supply will deliver sufficient power over 3 pins vs 4.Ī complication there is, which pin do you make the sense pin? On lower power power supplies, you may only have a single 4+4 EPS connector. So if a power supply has one of those connectors, to be ATX compliant, it needs to be able to supply that amount of power, no more. The EPS 4 pin is required to be able to deliver 144 watts, whereas the spec for the EPS 8 pin is required to be able to deliver 288 watts. Even though the wiring and plug type should be capable of far more power than will be drawn from the cable, this does not mean the power supply on the other end is capable of delivering it. Updating the instruction manual would be far cheaper than scrapping thousands of motherboards.Īnother possibility is that using one of the pins for sense is outside of the ATX spec. ![]() A simple one is, not realizing this was a problem until after the specs were finalized and a large production run had completed. Click to expand.There could be many reasons for that.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |