An SFP+ port accepts a module, and the equipment decides in firmware which modules it accepts - which is why a transceiver that works in one switch sits dark in another. Third-party modules identify themselves as a named vendor's part, and every "compatible with" phrase below is that claim, recorded as a claim. 19 modules in stock across 4 types, carrying 13 seller compatibility claims between them. If both ends are yours and close together, a direct-attach cable avoids all of this.
Prices updated · live figures update every 4-5 hours
Every "compatible with" phrase below is the seller's own wording, recorded as a claim and badged. We have not tested any module against any switch.
| Module | Type | Brand | Seller compatibility claims | Price | |
|---|---|---|---|---|---|
| SFP+ 10GBASE-T module | 10GBASE-T | H!Fiber | Cisco SFP-10G-T-S, D-Link, Merakiseller claim | $22.99 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | H!Fiber | Cisco SFP-10G-T-S, D-Link, Merakiseller claim | $29.99 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | 10Gtek | none stated | $31.49 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | 10Gtek | none stated | $31.99 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | 10Gtek | none stated | $39.99 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | 10Gtek | Intelseller claim | $42.39 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | 10Gtek | none stated | $44.99 | Buy |
| SFP+ 10GBASE-T module | 10GBASE-T | 10Gtek | none stated | $49.99 | Buy |
Every "compatible with" phrase below is the seller's own wording, recorded as a claim and badged. We have not tested any module against any switch.
Every "compatible with" phrase below is the seller's own wording, recorded as a claim and badged. We have not tested any module against any switch.
Every "compatible with" phrase below is the seller's own wording, recorded as a claim and badged. We have not tested any module against any switch.
An SFP+ port is a cage, not a socket. It accepts a module, and which modules it accepts is a decision the equipment maker gets to make in firmware. That single fact generates almost every frustration in this category.
Vendor coding is the mechanism. A transceiver carries a small amount of identifying information, and switches and network cards can read it and refuse to bring the port up if the module does not identify as an approved part. This is documented behaviour rather than folklore, and it exists for reasons the vendors would describe as support and qualification and their customers would often describe as lock-in. Either way it is real, and it is why a module that works perfectly in one switch will sit dark in another.
The third-party module industry exists to route around this. Manufacturers like the ones in our table program their modules to identify as whichever vendor's part you ask for, and sell the same physical module under a dozen compatibility labels. That is what the compatibility claims in the table are: a statement about how the module identifies itself.
We record those claims and badge them. We do not verify them, because verifying them would mean owning every switch they name. Anyone who tells you confidently that a specific third-party module works in a specific switch, without having tried that combination, is guessing - and the guess is usually right, which is exactly what makes the occasional failure so annoying.
The practical advice is unglamorous. Buy from a seller with a returns policy. If your switch has a setting to accept unapproved modules, know where it is before you need it. And if the link is short and both ends are yours, a direct-attach cable sidesteps the entire question, because there is no module to reject.
10GBASE-T modules convert an SFP+ cage into an RJ45 socket so it can meet copper structured cabling. They are the most expensive per port of the four types and the hottest, and they exist to solve one specific problem: an SFP+ machine that has to reach an RJ45 wall socket. Reach depends on cable specification, and the sellers who state a figure state it in metres over Cat6a.
SR optics - short range - are multimode fibre modules for runs inside a building. They are the cheapest optical option and the most common in a rack. They need multimode fibre and a module at each end.
LR optics - long range - are single-mode modules for genuinely long runs, measured in kilometres rather than metres. They cost more than SR and they need single-mode fibre. For anything inside one building they are more module than the job needs.
AOC - active optical cable - packages two optical ends and the fibre between them into one sealed object, like a DAC but optical. You give up the ability to change either end and you gain a much longer reach than passive copper, with no module compatibility question at either end because the ends are matched at the factory.
Each type is priced separately in the tables below rather than ranked together, because a copper module and an SR optic are not competing for the same purchase. Mixing them in one list would put the cheapest optic at the top of a table someone was reading to buy a copper module.
10GBASE-T modules run hot. That is the single most common complaint about them, and the direction of the effect is documented at product level: converting 10GbE to twisted-pair copper takes considerably more signal processing than passing it through a passive cable, and the SFP+ cage was designed around the thermal budget of the latter.
We publish no wattage. Per-port figures for both paths circulate widely and are broadly consistent with each other, but we have not fetched and logged a source we could point you at, and a number you cannot check is not a number worth printing. When we have the datasheets the figures will appear here with citations attached.
There is one piece of evidence in our own table that does not require a figure, and it is a good one. One of the modules listed below is sold by its maker as a low-power variant - that is the seller's own product naming, visible on the listing. A manufacturer offering a low-power version of the copper module, and not of the optical ones, tells you which module type has a power problem without anybody having to quote a watt.
If the heat matters to you, the mitigations are ordinary: give the cage airflow, avoid stacking copper modules in adjacent ports where the design allows, and prefer a direct-attach cable when the run is short enough to allow one.
At the claims level rather than the guarantee level, because that is the only level we can honestly operate at.
Mellanox ConnectX cards have a reputation for being relatively relaxed about third-party modules, which is a large part of why they are the community default for home builds. Intel-branded cards have historically been stricter, applying transceiver policies in firmware - the X520 in particular is the card people most often report trouble with. Third-party boards built on Intel silicon frequently do not implement the same restriction, which is one reason they are popular beyond simply being cheaper.
None of that is a guarantee about your specific card, firmware revision and module combination, and we are not going to present it as one. It is the shape of the reported experience, and the reason our recommendation for a two-machine build is a direct-attach cable rather than modules at all.
If you do need modules, buy the two ends together from one seller, matched to each other, and keep the returns window in mind until you have seen the link come up.
DAC cables are the option that removes the compatibility question entirely · DAC versus fibre covers when copper stops being enough · the 10GbE hub has every card these plug into · SFP+ versus 10GBASE-T is the architecture decision upstream of this page.
Often, and we cannot promise it. Vendor coding is documented and real: switches and cards read a module's identifying information and can refuse it. Third-party makers program their modules to identify as a named vendor's part, and the compatibility list on a listing is a statement about that programming - a seller claim, which we record and badge rather than verify. Buy from a seller with a returns policy, and check whether your switch has a setting to accept unapproved modules.
Reach and fibre type. SR is short range over multimode fibre, for runs inside a building, and is the cheaper of the two. LR is long range over single-mode fibre, measured in kilometres. For anything inside one building, SR is the right module and LR is more than the job needs.
Because they do far more work than the alternatives. A copper module converts 10GbE to twisted-pair signalling, which takes considerable processing, where a direct-attach cable just carries the signal. That extra work costs money and produces heat, in a cage designed around a passive cable's thermal budget. We do not publish a wattage because we have not sourced a citable one - but one maker sells a 'low power' variant of this module type and not of the optical ones, which is its own kind of evidence.
Not if your two machines are close together. A passive direct-attach copper cable has the module ends moulded on permanently and is far cheaper than two modules plus a fibre, draws almost nothing, and cannot be rejected for identifying wrongly because there is nothing to reject. Modules are for runs that copper cannot make, or for meeting cabling you already have.
Yes. The two ends of a fibre link do not talk to each other about branding - each module only has to satisfy the device it is plugged into. What must match is the type and the fibre: SR to SR over multimode, LR to LR over single-mode. Mixing types or fibre grades is where links fail to come up.
That it will negotiate speeds below 10G as well - typically 1G, 2.5G, 5G and 10G. That is useful when the far end is not 10GbE, because the link simply runs at the lower speed instead of failing. It also means a link that quietly settles at 2.5G looks identical to one running at 10G until you check, which is a common source of 'I upgraded and nothing changed'.
Specification claims on this page were checked against the pages below on 4 August 2026. Where a widely-repeated figure did not survive that check, we report what the source says now and say so in the text rather than repeating the familiar number.