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May 22nd, 2025 14:30
Dell Precision Tower 5820 - upgrading to RTX 4090 graphics card
Hello all,
My Dell Precision 5820 has a Intel i9-10900x CPU, 32 GB RAM and a Quadro P2000 with 950W power supply. I am starting a 3 year PhD and will be needing a powerful card for ML tasks. I will therefore like to upgrade it to a RTX 4090.
Does anybody have experience with the following:
(1) Does the card fit in the case (with my measurements it looks like it should just fit),
(2) will the card get sufficient power from the 2 PCIe 8-pins + the one free 10-pin connector (I will be using the 10 to 8 pin power adapter cable i have seen mentioned here previously from Amazon) - It feels a little shady to use just 3, where one is a 10-to-8 adapter ...
(3) Will the computer run safely with the side panel off (I have inserted a little part of a pencil into the switch and taped it over so the PC thinks the side panel is on).
(4) based on the possible bottlenecks from the Gen 3 PCIe slots, possibly the CPU and the power issue, is it even worth it to install a 4090 into the 5820? Keep in mind i am not going to play any games, just ML tasks on large weather-data ...
Thank you for your help.
Erlend
Ahn Nguyen
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June 6th, 2025 12:53
I think most RTX 4090 cards won’t fit properly, or they might fit only if you leave the PC case open. I'm currently using a PNY RTX 5070, and it fits perfectly inside the case, but I still had to use a 180-degree angle adapter in order to close the case. Most RTX 4090 cards are significantly larger than the PNY RTX 5070, so fitting them would be even more difficult.
Ahn Nguyen
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June 7th, 2025 11:42
You can refer to this topic: https://www.dell.com/community/en/conversations/precision-fixed-workstations/dell-precision-5820-with-rog-strix-4090/647fa234f4ccf8a8de7a1e4d
Someone actually installed an RTX 4090 and used it in the way you mentioned. It seems to be working well. I also used to keep my case open and ran the system like that for a while. I didn’t have any issues, except for more dust buildup, so I had to clean the PC more frequently.
If you're upgrading your system to run ML tasks on large weather-data, then in addition to upgrading the GPU, you should probably consider increasing your RAM as well. For large-scale weather data processing, 32GB of RAM is likely not sufficient.
erlendok
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June 10th, 2025 09:58
@Ahn Nguyen Thanks for the answer! Good to see that you could run the computer with the side panel off; I had no intension of trying to fit the card and be able to close the case.
I have seen the post by Flavius Aetius about the ROG Strix 4090, but could not find information on whether the card get sufficient power from the two PCIe 8-pins + the one 10-pin connector (e.g. three 8-pins), or if it is even worth it with the possible bottlenecks of such a powerful card in an this configuration.