Default Power Limit not equal to Max Power Limit
This is not news, but it is one of the new stumbling blocks in the adapter story. For those who already have a suitable 12VHPWR cable to the power supply and don’t need to use the adapter, this is of course not relevant. For the rest, however, it is. Let’s first take a look at the RTX 4090 FE. The max power limit is 600 watts, despite only three connected cables. The other limits are 450 watts and you can actually do whatever you want.
However, if you take a board partner card with more than 450 watts TBP and connect only three cables, you will see something like this, for example. The Max Power Limit is automatically set to 450 watts (logical, there is no cable), but the default power limit of the card is still at 480 watts!
What happens then is almost funny, because this case was not caught in the firmware at all before launch. I had therefore also contacted NVIDIA and the board partners, because here the firmware simply calculates backwards and outputs values that are incomprehensible to the user.
By the way, colleagues also had this mischief with four connected cables after the first start, but the MSI Afterburner’s reset function helped to get back to 100% and more. But if you only connected three cables, you were out of luck. And then came a new BIOS from NVIDIA. Unfortunately, the effect was very annoying, because the correct values were now displayed in GPU-Z, but the card was not displayed when it was only connected with three cables, that means no longer recognized properly at all. 3D applications did not run and the Afterburner also remained completely gray.
I’ll leave it open whether this is better now, because I’m very sure that it could have been done better (and right). By the way, if you think you can just turn off the computer, reconnect the fourth cable and restart, you are sadly mistaken. One must first completely uninstall and reinstall the driver, otherwise the card remains a pure 2D card! The Afterburner trick doesn’t help either, since the software didn’t recognize any card in the first place.
Fact is: every card that (at least theoretically) has a power limit of more than 450 MUST be supplied with all 4 cables of the adapter. However, with three cables and the setting to only want to use up to 450 watts, you can also simply connect the sense pin of the fourth open cable to ground. In fact, a simple bridge across both sense pins of this socket is sufficient, since the other one is already connected to ground in the socket. But I really must warn you not to use this to force the 600 watts unless at least three 16AWG cables have been connected! Otherwise it becomes dangerous. So please do not copy!
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