You can only mount two M2's in a 5820/7820. I think the 7920 can handle 4. I don't have a 7920 to look at. All enclosures had nearly the same speeds. Enough that I wouldn't care one way or the other about it. You are limited to about 1050MB/s read & write for sequential files. Transcend's CM80 enclosure is designed specifically for M.2 SATA SSDs. By following the step-by-step installation guide, you can transform an M.2 SATA SSD into a portable USB 3.1 Gen 2 external drive, maximizing utilization. M3X3 screw(most computers include these. These secure the Y1WJX M.2 drive carrier, or a 2.5" drive into 745TM)

Dell Installing NVMe SSD in Precision 5820 / FlexBay - Dell

Full-custom loop builds: Meshify C (Full custom loop SLI) , Ncase M1(8700K + 1080Ti Full custom loop) Obsidian 900D (1950X + Quad 1080Ti)& Fractal Define C (1080 in SLI) SIIG Full Speed M.2 M Key Nvme SSD to PCIe Adapter, PCI Express X16 Card with Heatsink, Supports Windows 7/8/ 10, Supports 2230, 2242, 2260, 2280 Form Factor M.2 SSDS Generally if the drive is readable I'll boot off a custom WinPE disk I built and run USMT to salvage the user profile data to a compressed MIG store. Then I'll replace the drive or laptop, re-image, and restore the salvaged profile. So the faster the drive is the faster I can complete these tasks. Which makes users happier. I've been using a M2 Sata enclosure, but I also have 2.5" external cables that let me plug a 2.5" directly into a USB port.I don't have any of the benchmark screen shots, I'd have to grab a virgin drive and test to snag them. HEDT: i9 10980XE @ 4.9 gHz, 64GB @ 3600mHz CL14 G.Skill Trident-Z DDR4, 2x Nvidia Titan RTX NVLink SLI, Corsair AX1600i, Samsung 960 Pro 2TB OS/apps, Samsung 850 EVO 4TB media, LG 38GL950G-B monitor, Drop CTRL keyboard, Decus Respec mouse

M.2 SATA SSD Docking And Cloning Icy Box External USB3.0, M.2 SATA SSD Docking And Cloning

NOTE:Even though Dell Hosted Images have USB3 drivers slip streamed in, they may not include the IRST driver (also known as the F6 driver). As a result, the IRST driver must be applied manually during the Windows install process. Basically, if you are installing it into an external USB enclosure the fastest drive isn't worth much. The quality of the USB enclosure provides more of a boost than the fastest NVMe drive will. AMD 7950x / Asus Strix B650E / 64GB @ 6000c30 / 2TB Samsung 980 Pro Heatsink 4.0x4 / 7.68TB Samsung PM9A3 / 3.84TB Samsung PM983 / 44TB Synology 1522+ / MSI Gaming Trio 4090 / EVGA G6 1000w /Thermaltake View71 / LG C1 48in OLED OptiPlex 3050 Small Form Factor, OptiPlex 5040 Tower, OptiPlex 5040 Small Form Factor, OptiPlex 5050 Tower, OptiPlex 5050 Micro, OptiPlex 5050 Small Form Factor, OptiPlex 7040 Tower, OptiPlex 7040 Micro, OptiPlex 7040 Small Form Factor, OptiPlex 7050 Tower, OptiPlex 7050 Micro, OptiPlex 7050 Small Form Factor, Precision 5520, Precision 7520, Precision 7720, Precision 5510, Precision 7510, Precision 7710, XPS 13 9350, XPS 13 9360, XPS 13 9365 2-in-1, XPS 15 9550, XPS 15 9560The part number you listed, when you Google it, comes up as the Flexbay for a PowerEdge server and not the T5820. Now installing the kit 750-ABDF can be a real problem, as Dell provides no instructions with the kit, and the Dell instructional videos allegedly installing the kit are not helpful (worthless in my opinion), there is no instruction in the 5820T user manual, and I could not find any helpful stuff on the internet (specifically, where the cables connect to the system board.