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April 7th, 2025 23:43
T5820 incompatibility M.2 Gen 3 and Gen 4
Hi, I just bought a M.2 Samsung 990Pro Gen4 for my T5820 with a Quad NVME card, when I plugged in the drive, it was not recognized, I tested the other slots and plugged and unplugged the other M.2 Gen3 cards, and apparently it is an incompatibility between generations, is this so?
The only way for the 990Pro to be recognized is to put it in slots 2 or 3 (slot 1 is reserved for the O.S.) but this automatically disables slot 4.
I have the BIOS and drivers updated. Is this a known problem in DELL T5820? Can I still use all 4 slots or should I get an M.2 Gen 3?
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leowork
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April 11th, 2025 04:57
Hello, I close the topic, because without me having touched anything, tonight when I logged on the T5820 the 4 nvme units appeared... I do not understand it, but there they are.
Thank you very much for your attention.
Chino de Oro
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April 8th, 2025 03:46
Hello @leowork , on the 5820, slot 3 is PCIe x1 and should not be used for Ultra-Speed Quad with PCIe x16. Below is the lane specifications for PCIe slots for better troubleshooting the issue. Slot 1 is the closest slot to the CPU and memory complex.
leowork
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April 8th, 2025 04:10
Hi @Chino de Oro , sorry for not specifying this detail. I have a Xeon 2145, with a 950W power supply.
Slot 1 I have a wifi card.
Slot 2 and 3 the video card
Slot 4 the Ultra speed Quad
Slot 5 thunderbolt card
Slot 6 a sound card
Before adding the fourth m.2, I was already using three m.2 slots.
Chino de Oro
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April 8th, 2025 04:34
I see. So, I guess when you mentioned about the 990pro works on slot 2 or slot 3 but it disabled slot 4, all were referred to the slots on the Ultra-Speed adapter.
Anything on the top flexbay? If any of the NVMe drive from flexbay can be swapped to the Ultra-Speed adapter and the 990pro will go into one of the flexbay.
Chino de Oro
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April 8th, 2025 05:22
@leowork , it seems that you have all PCIe slots occupied. I had upgraded a 5820 with Xeon W-2295 and similar PCIe slot components. Except that I had OS boot on slot 1, a single slot RTX A4000 on slot 2, WiFi/Bluetooth on slot 3. Asus quad adapter with 4x 22110 NVMe on slot 4, thunderbolt 3 on slot 5.
Top flexbay with 2x NVMe, bottom flexbay with 2x Iron Wolf HDD. The 5.25 bay with Icy dock and 4x 2.5 SATA SSD. All are hot swap, removeable.
I hope these information may give you some idea to update your system with taking advantage of system designs for optimum performance and usages.
(edited)
leowork
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April 8th, 2025 06:46
@Chino de Oro No unit in flexbay, all M.2 are in the ultra speed quad.
Chino de Oro
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April 8th, 2025 07:22
You may also play around with bus allocation settings to see if that will help the Ultra-Speed adapter to recognize all 4 NVMe drives, including the Samsung 990 pro.
https://www.dell.com/support/kbdoc/en-us/000146802/pcie-bus-allocation-in-dell-precision-5820-7820-7920-tower