![]() ![]() One of the two sense pins per 6+2 socket was not directly connected to any of the lines, not even to the first two sideband contacts that are responsible for detecting the TBP in the 12VHPWR. And that’s exactly why the whole story can unfortunately be operated with a single cable, if you additionally do some tricks. Of course, this also eliminates the possibility of detecting missing rails, as you used to be able to do circuit-wise on the graphics card board when a connector was missing. Without connected cables, the six 12V pins and the six ground pins are already bridged in this plug, so that there is only one voltage rail. So I uncovered all the cables and actually saw exactly what I had expected from my first measurements between the cables. So it had to be a simple switching logic (some AND gates) which then switches the two pins of the 12VHPWR accordingly. Do you notice anything? You can even do this with just 2 cables, or….īut that would be much too easy and NVIDIA always counts on the “cluelessness” of the customers. If you plug in only the 2-pin (sense) instead of the whole 6+2 connector and leave out the 6-pin for 12V and ground, then everything works as desired. But I’ll get to that in a moment, when it comes to the partly inexplicable effects and various BIOS errors. Out of a certain curiosity, I then staked out the fourth port and experienced a disaster with a board partner card. But since I have a very well-stocked cable box, a Y-piece was quickly found. This is annoying in that NVIDIA’s nice PCAT tool for measuring power consumption only has three rails. Two cables are useless and not usedĮven before the launch, I had noticed that the power limit of the RTX 4090 FE automatically decreases when you leave out a cable. Everything described here in the following concerns the respective front view of the adapter’s connections and not the graphics card or plugged 6+2 pin cables! That’s so. Since NVIDIA did not even want to reveal how the adapter’s logic works to board partners and power supply manufacturers, only their own lab remained.Ī small preliminary remark is also important: For all pinouts I consider the 12VHPWR as male and the four 8-pin connectors as female, so that the pinouts are mostly mirror-inverted to what you usually find on the internet for the respective connectors. It is in the nature of things that it works, but you also have to know how this adapter works. I had said in the launch video that the card could theoretically be operated with a single 6+2-pin cable and was then severely criticized by some. Of course, one could have simply unraveled (and thus certainly destroyed) all of this, but first, I don’t have that many adapters, and second, it’s always a sporting challenge to get such details out that way, too. Try & Error The trick with the smart adapter However, it was exactly this circumstance that aroused my curiosity, because there were definitely problems in the interaction of the “smart” adapter and the firmware of some on-board partner cards that should not have occurred like this. It also doesn’t matter which of the four ports you leave free. Click on the Options button to bring up the GPU select windowħ.Who doesn’t know it, the funny adapter from NVIDIA, with which you can merge four PCIe 6+2 pin cables to be able to run graphics cards with up to 600 watts? If you only connect three plugs, you’ll only get 450 watts and with two plugs, the PC won’t start at all with a bit of bad luck. Click on the Browse button and then choose the executable for the application you wish to force the GPUĦ. Choose Graphics setting link from the bottom of the pageĥ. On your keyboard, press the Windows key + the letter "i" at the same time to bring up the Windows SettingsĤ. To force Windows to use a GPU for a particular app using the Windows display settings, follow the steps below:ġ.Global Settings | Program Settings > Preferred graphics processor setting. ![]() If the OS does not specify a graphic processor preference for a given application, then users can specify the preferred graphics processor to use from the NVIDIA Control Panel > Manage 3D Settings >
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