StarTech.com Citrix 455883-B21 Compatible QSFP+ Module - 40GBASE-SR4 - Multi Mode Fiber (MMF) - 40GE Gigabit Ethernet QSFP+ - MPO 100 m - 850nm - DDM~Citrix 3013936-E2 Compatible QSFP+ Module - 40GBASE-SR4 - Multi Mode Fiber (MMF) - 40GE Gigabit Ethernet QSFP+ - MPO 100m - 850nm - DDM

Product Overview

AI-generated summary

At £32.47 ex-VAT, this is the sort of QSFP+ fibre module that makes sense when you’re trying to keep a lab, overflow rack, or an existing 40GbE build running without paying “proper brand” money. If your switch/transceiver expectations are realistic (i.e., you’re using it for short-reach multimode, and your optics/vendor compatibility is genuinely in the supported lane), you’ll usually be fine. The big practical win is cost control: replacing a dead module or adding capacity for cheap, with DDM support so you can at least monitor thresholds and spot faults before they turn into outages.

That said, I’d be cautious about buying these purely on price. Citrix-branded/compatibility listings on third-party optics can be a bit of a grey area in the real world—some platforms are pickier than others, and authentication/compatibility behaviour can vary by switch model and firmware. For anything mission-critical, you’re better off confirming it’s explicitly supported by your exact switch model/version, and you’ll want to check your MPO/Multi-mode fibre and patching quality because 100m performance lives and dies by cabling cleanliness and light loss. If you’re set on value and you’ve validated compatibility ahead of time, buy it; if you can’t validate, don’t—£32.47 is cheap only until you’re swapping modules at 2am.