Need help with dual psu and gpu setup on a Dell T5810

Hi there. I am confused about how to connect a RTX 3090 on a Dell T5810. T5810 has a 450W power supply and there is not enough pin to connect 2x8pin on 3090. So, i am thinking of getting a secondary PSU, maybe a bequiet 750/850/1000W just for the GPU (with a way for future expansion to a 2nd GPU setup).

I understand that i need something like a ADD2PSU adapter to make sure the secondary PSU is also switched On to use the GPU. But, not sure about the PCIe connection.

  1. Should i plug the 3090 to T5810 PCIex16 slot as usually and then connect the GPU’s 2x8pin from the bequiet PSU ? Does this mean the GPU would consume around 50-75W via the PCIe from T5810 primary PSU and the remaining 280-300W from the secondary bequiet PSU ?

  2. Wouldn’t a dual PSU setup like this cause operational and performance issues as two different PSUs influencing the power draw of GPU ?

I am thankful for your insights and assistance.

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Generally this is ill advised
The T5810 supports up to 685W PS from Dell as OEM configuration

If I recall, there’s a proprietary connector on the MoBo.

If that 10 pin is standard PCIe, (after voltage readings while on) then swap the main PSU.

Daisy chained PSU’s is fine for testing or data recoveries, but generally not something you want to do for even a home lab configuration

do not run 2 power supplies in a normal use computer. there is several options for PSU upgrades in the T5810.

https://www.dell.com/community/en/conversations/precision-fixed-workstations/power-supply-options-for-the-t5810/647f8cc7f4ccf8a8ded281a7#:~:text=I%20have%20a%20Dell%20t5810%20with%20the%20685W%20power?msockid=22c3a076f60e6370366ab2a8f7f66209

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As Dell likes to use proprietary Mainboard connectors as well, he might not be able to power the board as there probably is no standard 24pin connector.

That’s why I stay far away from OEMs…vendor lock-in is real with PSU+Board+other components.

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Thanks.

As far as i have read, its a 24 pin connector but not a standard one and has a different voltage level.

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Thanks. The link provides info, but i couldn’t decipher how to split the 6-8 pin into a 2x8 pin as 3090 requires them.

Furthermore i can only find 625W PSU and rarely 850W PSU. Since my cpu is a E5-2680v4, i should definitely have a 1300W PSU to cover any transient loads. Unfortunately, i don’t see any 1300W available at the moment.

i get you. I do try to stay away, but when i got this t5810 it was too budget friendly to miss out.

Anyway, if this t5810 doesn’t work out, will it be useful to go with a Supermicro CSE-819u X10DRU-i+ ? I see it has enough pin outs to connect the GPUs? Though i guess the gpu size would be a problem. I have the SM server laying aroung for some time with 2x750W PSU.