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Dell R740XD LFF Riser Configurations Confusion for GPU and NVME
Hi everyone,
I recently purchased a used Dell R740xd LFF with mid and rear storage bays (all 3.5) to be used as a home server with UNRAID.
- I have a RTX A2000 GPU that doesn't require a power cable which consumes max 70W. I purchased a Riser 1A to connect it into R740xd as it has dual 16x slots. When I checked the owners manual, though riser configurations listed there only allows Riser 1b (only 8x slots) to keep the rear storage bays. Riser 1A configurations include full height riser 2 cards like 2A which will probably require me to remove the rear storage bays. Questions here;
* Do I have to buy the riser cards listed in specific riser configurations or can I just use Riser 1A standalone to connect the GPU?
* Riser 2C seems to be low profile that can be placed under rear storage bays, however riser 1A+2C is not listed in the riser configurations, can I make custom riser configurations like 1A+2C to keep my rear storage bays?
I also found a Dell NVME mid bay part (MFMV5) that requires Dell PCIe extender expansion card on Riser 2. Question becomes again can I combine Riser 1A and 2C to accomplish GPU on Risers 1A and Dell PCIE extender expansion card.to enable NVME on midbay MFMV5? I am concerned if DELL IDRAC bios wouldn't allow me.
Any feedback would be appreciated.
DELL-Young E
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June 4th, 2024 06:13
Hello, thanks for choosing Dell and welcome to our community.
* Do I have to buy the riser cards listed in specific riser configurations or can I just use Riser 1A standalone to connect the GPU?
* Riser 2C seems to be low profile that can be placed under rear storage bays, however riser 1A+2C is not listed in the riser configurations, can I make custom riser configurations like 1A+2C to keep my rear storage bays?
I'm afraid Dell can not guarantee on anything that's not listed. It means we have not tested it ourselves so it can't be official as you may be well aware.
The part information I can give you is this
Part #:MFMV5
Part Desc.:ASSY,DR,SSD,4X2.5,MID,R740XD,Z
But I don't think this is the only thing you may need, such as cables, etc.
Overall, I'd say right now it's best to hear from those who have actually applied this and have experience in this.
Respectfully,
mesencephalon
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June 4th, 2024 12:25
@DELL-Young E Thanks, could you please let me know what riser 2 and 3 types are compatible with rear storage bays?
DELL-Chris H
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June 4th, 2024 12:49
2a would be the full height PCIe riser
2B would be for the 1x8
2C would be for the 1x16
2D would be for the PCIe 1x16 or 2x8
2E and 2F are for the A series GPUs
For riser 3 you have 3B for the A series GPUs as well.
mesencephalon
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June 4th, 2024 15:46
@DELL-Chris H Thanks Chris, which of these can be placed under rear storage bays or compatible with rear storage bays?
(edited)
DELL-Chris H
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June 4th, 2024 20:19
The only one showing for the rear is 2a (part # J7W3K).
mesencephalon
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June 5th, 2024 18:22
@DELL-Chris H owner's manual lists 2b and 2c, could you please double check? 2a should be reserved for GPU which defeats the rear bays.
DELL-Chris H
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June 5th, 2024 20:16
Sorry about that I was indeed focused on the GPU, as far as the rear storage you're correct on 2B and 2C.
mesencephalon
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June 20th, 2024 13:15
I configured it with riser 1b and 2c. I placed a Nvidia rtx a2000 GPU on one of the riser 1b slots and it works perfectly fine as this GPU doesn't need additional power and max power it requires is 70w and PCIE power from the slot is sufficient.
My question here; can I use the other riser 1b slots along with this GPU? PCIE power limit seems to be 75w with this riser 1b but it's not clear if it's 75w for the whole riser or 75w per PCIE slot? Could you please help with that question?
DELL-Chris H
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June 20th, 2024 13:28
Mesencephalon,
The limitation would be based on the slot not the riser, and normally I think that 75w limitation is just the guideline before needing a GPU power cable.