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4U GPU Enhanced Standard Chassis 4x 3.5" HDD + 6x 5.25" Bays - 8x Full Height Slots for 4x Double Width GPU - Server Case
3U (3 x 5.25" + 5 x 3.5" + 2 x 2.5" Horizontally HDD Bay) (USB3.0 x 2) (15.16" Deep) (ATX / Micro-ATX / Mini ITX) Rackmount Chassis IPC-E339B
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TGC Rack Mountable Server Case 2U TGC-2812, 12 x 3.5" HotSwap Bays, 6Gb SATA/SAS Backplane, FH Expansion Slots, 2U PSU Required, ATX | Rosman Computers
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Amazon.com: 3U Storage Server Chassis Widely Used in Cloud Storage, Big Data, Security Monitoring, Internet of Things and Other Fields Empty case : Electronics
I can't really decide if i have found the holy grail of cheap nas-server chassis? Inter-Tech 4F28 : r/homelab
3U/4U case for NAS - Cases / Chassis - Level1Techs Forums