Recently, there have been 5 consecutive news about RTX 4090 fires, and I believe everyone has seen it. The results of these accidents are surprisingly similar, that is, the auxiliary power supply interface caught fire and burned. If we look closely, we will find that they are still burning from the outermost side!
Regarding this issue, we have also collected relevant information and consulted the power supply manufacturer in detail.
First of all, many new 16pin interface usage specifications are circulated on the Internet. The specification requires that at least 35mm of length should be left at the 16pin interface before it starts to bend. If the bend position is too close to the interface, it will easily lead to poor contact of the terminal, and the impedance increases, which will make it easier to burn under high loads.
Pay attention to the last few keywords, which are poor contact, increased impedance, and are more likely to burn.
In fact, the interface caught fire this time. We guessed that it was because of uneven current and hole reaming. The core problem is that such a small terminal volume passes through such a large current. Once the bias current occurs, it is very easy to break the limit.
Someone asked the previous 4*8pin was also 600W, so why hasn't there been any similar situation? Although
is also 600W, each of the 8pin interfaces only bear 150W power supply, the pins are thicker and the heat generation is much smaller. In this way, even if there is a slight fluctuation in any way, it will not affect the overall situation.
Then let’s take a look at a specification chart. In the ATX 3.0 standard of Intel, how thin a single needle is, and each such thin pin must withstand 9.2A current. You can imagine how much risk it is when a hole reams occur.
hole reaming is actually a simple literal meaning. After inserting and unplugging to a certain number of times, the joint between the pin and the terminal is not so tight, which leads to the increase of internal resistance , thereby increasing the temperature rise.
has another specified standard. The number of plug-ins and unplugging of this 16pin interface was limited to within 25 times in the early stage, and has now increased to 30 times. That is, after exceeding this number of times, there will be risks.
But usually players do not plug and unplug frequently like our test platform, so why does this kind of burning happen?
This requires going back to the event itself. Careful friends must have found that both events occur from pins on both sides of the interface, and there will be no problem in the middle.
This is because first of all, the RTX 40 series graphics cards are relatively wide, and the adapter is very close to the side panel of the chassis, or they are simply close to the side panel. In such a bent situation, although the internal cable will not be affected, the interface part will still be corrected by a rebound force of the wire itself.
The pins on both sides of the interface cannot be bound and protected on both sides like the pins in the middle, so the force affected by the wire is the greatest.
Therefore, it is not surprising that this stress relationship will be maintained for a long time, and the temperature will increase due to hole reaming and causing fire.
Since you insert it directly and bend it will be subjected to stress. So, wouldn’t it be better to make a 90° right-angle line like in the figure?
is usually OK, for example, the SATA line we see has a similar design. But unfortunately, with current technology, it seems that it is not possible to safely pass such a high power as 600W.
So at present, the best way is to directly use 16pin wire and do not transfer. Although the port is still the same, many risks can be avoided in the middle.
First, we all know that the current 8pin power supply is all powered by the PCIe interface of the power supply, and then the one-two-two 8pin is divided.
makes a rough metaphor. The current is like a waterfall, which goes straight from the source and forms a tributary next to it. Although the two forces have the same clan and the same origin, in the case of large flow, there will definitely be uneven flow.
although it will not be so exaggerated in the power supply. However, in the case of high current, there will still be a pressure difference between the two 8pins, which will increase the risk of bias current.
In the past, no matter whether it was 8pin*3 or 8pin*4, even if there was a slight bias current, the power of each interface was there, no more or less than 150W. And 16pin is a full 600W.
Secondly, if you use adapter cable, the current transfer distance will also increase, and there will be a certain length of loss.
I believe that after reading the above explanation, the players who have no idea how to buy 4090, but it is not that exaggerated.
First of all, it is recommended that players buy a power supply that meets the ATX3.0 standard. Direct connection of 16pin is indeed much better.
In addition, if you do not intend to change the power supply and can only use the adapter cable, be careful not to bend the position close to the interface 35mm. Also, in the direction of the extension of the interface, it is best not to use a cable ties to pull it tightly for the sake of beauty as before, and try to avoid the rebound force of the wire to directly force the interface.
I hope you can eliminate panic after reading it and leave enough space for the graphics card and cable when installing it.
(8055537)
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