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Oceanlab
Newbie

Quoted
Initially, only the version shown will be available, either with the latch facing the PCB or away from it
It is planned to purchase the asus rog astral 5090 liquid edition
Which version of your product is suitable for me?
Will you be shipping this outside of Germany ?
Can you make sure that ampinel works for 5090 founders edition or any founders edition card? The recent connectors for founders edition are angled and not 90 degree
Maybe it is a stupid question, but since the output per pin currents regulated and monitored is there a good reason not to using a short extension cable (in a space restricted sff build) to connect it to the GPU?
jwingy
Newbie

As I understand it, some sort of extension cable would be required for this to work with a 5090 FE? If so, is there any specific type of cable you would recommend?
On the point of using an extension cable, it was said that: "...you have to be aware that
additional contact transitions can have a further negative impact on the
current flow." What does this mean / what are the implications of this exactly for a lay person? Thanks!
TechBaguette
Newbie

Your competition just unveiled their new product and in the video they say, that they decided against active load balancing because they dont know what is going to happen if you push higher current through pin that has higher resistance. What do you think about that?
Kazdi
Newbie

https://youtu.be/IY5Ak33rPg8?t=1096Your competition just unveiled their new product and in the video they say, that they decided against active load balancing because they dont know what is going to happen if you push higher current through pin that has higher resistance. What do you think about that?
What is going to happen if you push more current through the conductor that has a higher resistance is not a mystery. More current through a higher resistance means more voltage drop across that resistance, which results in more power being dissipated as heat. I don’t think the Ampinel works that way.
If one circuit path has a higher resistance, less current will flow through it. The Ampinel does not try to balance the current flowing through the 6 conductors by forcing more current through the high resistance path. Doing that would cause more heat to be generated, which further increases the resistance of the contact. A feedback loop is formed that results in a melted connector. My understanding is that the Ampinel adjusts the voltage drop across the total resistance in each circuit path. If 1 conductor has a higher resistance due to poor contact alignment, oxidation, or whatever reason, less current will flow through that conductor, not more, because V = I2R, so if the resistance is higher, the current must be reduced to keep the voltage drop the same. If the resistance is so high that the Ampinel cannot compensate for it, the Protection mechanisms are activated. That is how I think it works after reading Igor's Lab articles about the Ampinel. If I am wrong, perhaps someone from Aquacomputer will jump in here and clarify.
I am curious about this other new product. Can you provide a link to the video you mentioned?
Oh OK you were referring to a product, that I am already aware of. I thought there was another player entering this market. He expresses concern that the Ampinel will push more current through a conductor/contact that already has a problematic resistance. According to Igor’s Lab, that is not what the Ampinel does. Igor says the Ampinel does not attempt to push the same amount of current through all 6 conductors. Instead, it attempts to make the voltage drop across the effective resistance of all 6 circuits be the same. He says it does this by slightly increasing the resistance of the other 5 current paths. This is the part I don't understand. If the Ampinel increases the resistance of the other 5 current paths, and the GPU power demand remains the same, then the amount of current that has to flow to deliver that power stays the same. If the resistance of the other 5 current paths is increased, then more current has to flow through the bad path. I am hoping someone from Aquacomputer, or another forum member can clarify this point for me.https://youtu.be/IY5Ak33rPg8?t=1096
Kazdi
Newbie

Thx for detailed response. I dont understand everything, but i read all what you said and the igors article and i believe all is good. Active load balancing seems like the way to go. Iam already on the list to get notified when ampinel is up for preorder. I just dont want my 5090 to burnOh OK you were referring to a product, that I am already aware of. I thought there was another player entering this market. He expresses concern that the Ampinel will push more current through a conductor/contact that already has a problematic resistance. According to Igor’s Lab, that is not what the Ampinel does. Igor says the Ampinel does not attempt to push the same amount of current through all 6 conductors. Instead, it attempts to make the voltage drop across the effective resistance of all 6 circuits be the same. He says it does this by slightly increasing the resistance of the other 5 current paths. This is the part I don't understand. If the Ampinel increases the resistance of the other 5 current paths, and the GPU power demand remains the same, then the amount of current that has to flow to deliver that power stays the same. If the resistance of the other 5 current paths is increased, then more current has to flow through the bad path. I am hoping someone from Aquacomputer, or another forum member can clarify this point for me.
Here is a quote from his article about this. I also provided the link so you can read it yourself if you like.
“Update: the load balancer does not arbitrarily change the current on a line but seeks the electrical operating point at which the voltage drops across all lines are as equal as possible. If a pin carries less current due to higher contact resistance, the system is initially unstable because the other five paths take on more load. If nothing were done, the difference would grow ever larger, and that is exactly what is observed in unbalanced connectors. In this situation the balancer does not try to actively load the weak pin more but reduces the dominance of the overloaded paths by slightly raising the effective resistance there. The total current remains almost constant, the source, that is the power supply or the GPU load request, determines it, but the voltage distribution at the connector becomes equalized. This electrically reintegrates the “bad” contact without necessarily requiring it to carry its full one sixth load. The system does not aim for equal current shares but for minimal voltage deviations, in other words a stable state of equal distribution.”
Igor’s Lab reviewed the Ampinel a few weeks ago. That review is HERE.
There was a lot of confusion about how the device works, so he did a follow-up article that goes through the whole 12VHWPR/12V2X6 connector saga, what Nvidia did (or more accurately did not do), what Asus did, what der8auer did, and what the Ampinel does. He compares the strategies of just monitoring the current versus actively controlling it. In part 4 of the follow-up article, he addresses the concern that is expressed in that video. Maybe the author of that video still does not understand how the Ampinel works, or maybe he does...
Here is a LINK to part 4 of Igor's Lab follow-up article.
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