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Supermicro

1U Mainstream SuperServer R1I-523262

1U mainstream with 4 hot-swap 3.5" drive bays
Supports:

Intel Xeon E-2300
128 GB DDR4 ECC UDIMM
4 3.5" SATA/SAS Hot-Swap
1 PCIe 4.0 x8 LP \ 1 PCIe 4.0 x16
2 1GbE LAN Ports
$1,919.75

1U Mainstream SuperServer R1I-516461

1U UP mainstream with 4 hot-swap 3.5" drive bays and redundant power supplies
Supports:

Intel Xeon E-2300
128 GB DDR4 ECC UDIMM
4 3.5" SATA/SAS Hot-Swap
1 PCIe 4.0 x16
Redundant Power
$2,419.75

1U Mainstream SuperServer R1I-156164

1U Mainstream with 4 hot-swap 3.5" NVMe/SAS/SATA bays, 1 PCIe 4.0 x16 slot and single PSU
Supports:

Intel 3rd Gen Xeon Scalable
1 TB DDR4 ECC RDIMM
4 3.5" NVMe Hot-Swap
1 PCIe 4.0 x16
Optane
$4,344.23