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Interesting thoughts on riser power cables
Hello!
I have an r740 server. And the motherboard has riser power numbers 0, 1, and 2.
Here, after installing only the 1st riser kit and installing the GPU, is it possible to use both the 1st and 2nd riser auxiliary power supplies (225W each) to supply power to the GPU?
I thought that if this were possible, it would be possible to exceed the 300W power limit of the installable GPU.
I'm curious about your opinions.
DELL-Erman O
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June 27th, 2024 12:59
hmmm... you’ve got yourself an awesome RTX 4090 GPU, which is really powerful. as I know. Now, you want to put it in your old r740 server. At first I must to say that it is not supported by the server in official. So you take your own responsibility. But just I commented the problem is, the server’s power supply isn’t strong enough for this big card.
The riser cables you own only give 225W each, but the RTX 4090 needs I think at least twice that it needs a whopping 450W to run well. It’s like the card is super hungry and the cables are just tiny snacks. Probably forcing it can cause crashes, slow performance, or damage.
However lets see also how our community contribute it. Because their own experiences are valuable such a these cases.
Hope that helps!
DELL-Erman O
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June 27th, 2024 11:02
Hello,
I think utilizing both auxiliary power supplies from the risers is not expected to push the GPU’s power consumption over the 300W threshold on an R740 server. Despite each additional cable being rated for 225W, this does not imply that the GPU’s power capacity will be effectively doubled from its 300W limit. It’s important to consider the power constraints of the riser cards and the motherboard. Moreover, the GPU may not be designed to operate beyond 300W. Imagine these cables as additional lanes on a freeway; they provide more pathways, not an increase in the number of vehicles permitted.
Connecting both riser cables to your GPU appears to be safe and should not surpass the 300W limit. However, it’s crucial to be mindful that going over the power limits can lead to catastrophic outcomes for your equipment.
Also you might be check on this tool some configurations to simulate it https://dell.to/45KoR16
Hope that helps!
mate_of_wind
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June 27th, 2024 12:13
@DELL-Erman O
What do you think will happen if a 450W GPU like the RTX 4090 is installed?
mate_of_wind
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June 28th, 2024 03:12
@DELL-Erman O
I'll take responsibility and give it a try! I will share the results later. It will definitely be fun.