This is one of those articles that we have been working on as a STH team for almost a quarter now. We have tested a number of SFP+ to 10Gbase-T adapters and to be more exact, we have tested the entire front page of Amazon module search results. If we do get more modules, we will add them to our list below. What we wanted to do was provide some sense of what we saw across all of the modules we tried. As some context here, only 3-4 years ago these modules were sold by major vendors for $1000-2000 each. Now, one can find third party modules for $35-70. With this dramatic price drop, they have become extremely practical to use.
SFP+ to 10Gbase-T Adapter Module Video
Since this has been a push for STH, we have a video to accompany this buyer’s guide if you prefer to listen.
The video covers the first 9 modules we tested and what we found. We will keep this buyer’s guide updated if and when we test more modules.
SFP+ to 10Gbase-T Adapter Module Reviews
Since we have done individual reviews of each solution, we wanted to provide a quick look at the nine modules we tested for this guide in alphabetical order:
- 6COM 6C-SFP-10G-T 10Gbase-T Adapter Review
- ADOP 10GMS-30M-T 10Gbase-T Adapter Review
- FlyFiber SFP-10G-T-C 10Gbase-T Module Review
- FiBay 10G-SFP-T-CI 10Gbase-T Adapter Review
- HiFiber SFP+10GBASE-T ASF-10G-T 10Gbase-T Converter Review
- Ipolex ASF-10G-T and SFP-10G-T-S Review 10Gbase-T and Nbase-T Adapter
- MikroTik S+RJ10 Review Convert SFP+ to 10Gbase-T Inexpensively
- QSFPTEK QT-SFP-10G-T Review 10Gbase-T Adapter Module
- Wiitek SFP-10G-T Review 10Gbase-T Adapter
Other adapters reviewed after this guide:
You can reference these reviews for detailed photos and information about each of them. We have more detail on all of these options if you want to look at the individual reviews. Instead, this guide is going to be a summary piece.
The Cisco SFP-10G-T-S Myth
Many of these listings on Amazon claim that they are “Cisco SFP-10G-T-S” compatible. Here is an example from the Wiitek review:
There is one small issue with that claim. There is no Cisco SFP-10G-T-S on the company’s current compatibility matrix. Even though that part does not seem to be a real one, that seems to be what many of the 3rd party vendors are using for these units.
As a quick note on vendor compatibility, we are focused on using these in devices that do not require vendor-coded modules. This Cisco SFP-10G-T-S designation is designed to show that these modules are coded for Cisco switches. Our assumption is that your first filter on deciding a module is based on having the correct coding, if required, then looking at the options from there. We tend to use gear that does not enforce this coding in our lab with switches from Quanta, Edgecore, Celestica, MikroTik, and others.
Key Use Cases for the SFP+ to 10Gbase-T Adapter Modules
These modules are very flexible. As a result, one can use them in a few use-cases where they were not considered a few years ago when prices were 50 times higher. One of the biggest is in transitioning to a SFP+ based network. Here we have two modules in the MikroTik CRS326-24S+2Q+RM switch. This allows for 2.5/5/10Gbase-T ethernet to be used with a server, storage (e.g. ASUSTOR Lockerstor 8 AS6508T) or workstation (e.g. ASUS ROG Zenith II Extreme) over the existing copper wire without having to source a SFP+ based solution.
One can even use these modules simply to connect lower-end 1GbE switches that do not have 10GbE. With the current pricing, that can be less costly and easier to integrate.
Another area we have explored is using these modules in NICs.
The theory here is that one can utilize inexpensive SFP+ or SFP28 NICs and then these SFP+ to 10Gbase-T adapter modules and get access to traditional copper networking at a lower cost. Using dual-port NICs allows one port to still be used potentially at higher speeds as is the case with SFP28 25GbE NICs.
SFP+ to 10Gbase-T Adapter Module Nbase-T and Jumbo Frames Capabilities
One of the undocumented features that we found on many of these modules is the ability to run Nbase-T speeds of 2.5GbE and 5GbE. The modules themselves will usually say 1Gbps and 10Gbps capability but rarely mention these newer standards.
Here is what the matrix looks like:
As we would expect, all nine modules support both 10Gbase-T speeds and Jumbo Frames. Jumbo Frame support is often not listed on product pages. Still, it is a feature that we expect to see these days.
Of the nine, six also supported 2.5GbE and 5GbE speeds through the adapter, three did not. Most of the adapters do not claim that they support either of the lower-speed standards, so this is a bonus some modules offer.
Update: here is the updated table with some additional adapters:
We are still doing these reviews, and the features do change over time.
SFP+ to 10Gbase-T Adapter Module Performance
In terms of performance, we actually saw a much tighter grouping than we had expected when we first started this series. We thought we would see some of these modules offer 25% of the performance of others. This was especially the case when we saw the Nbase-T results showing that there were different underlying chipsets at work.
Based on the raw data transfer speeds, these seemed to be fairly tightly grouped results. When we applied the knowledge that six of the nine units support 2.5/5GbE speeds and three do not, we found an interesting grouping:
It turns out that the three that did not support Nbase-T had a +/- 1% variance in our test while the six that did support Nbase-T also held in their own +/- 1% variance range that was at a slightly higher level.
For most users, this is an extremely tight range representing a 4% delta from best to worst. Our sense is that there is some performance delta at 10Gbase-T speeds but not necessarily enough to call one a clear winner. We did not see a 25% delta as we were expecting. That means if you are solely after 10Gbase-T performance, then it is fairly difficult to make a recommendation on performance. The bigger delta seems to be 2.5/5GbE support.
SFP+ to 10Gbase-T Adapter Module Power Consumption
Power consumption is an important metric for two reasons. First, the SFP+ to 10Gbase-T modules use a lot of power, so one needs to asses the TCO impact of using these modules, especially when many are used or these are being deployed in highly power-sensitive environments. Second, and perhaps more importantly, SFP+ modules and cages are fairly well standardized so cooling rates are fairly constant. As a more powerful module is introduced that can have downstream impacts on the ability of a switch to cool the modules.
For this, we are measuring the impact on power consumption for our MikroTik CRS317-1G-16S+RM test switch using a 10m cable. The results held extremely steady and did not jitter even 0.1W on the Extech TrueRMS power meter for each module.
As you can see. The power consumption impact at the wall was generally 2.9W to 3.3W which is a small variance in watts (0.4W) but a large percentage. We were slightly surprised to see that we did not get a similar grouping as we saw on the performance side since that would confirm two chipsets being used by all of these parts.
In testing our first nine modules, we can see fairly decent uniformity. Completely unexpectedly, the Wiitek SFP-10G-T had the best performance, lowest power consumption, and worked with Jumbo Frames, and ran at 2.5/5GbE speeds. As a result, this is probably our top pick right now. We will note our test unit does not have a country of origin marking as it is required to have in order to be sold in the US, however, Amazon seems not to enforce this. Just know, that it could require a label re-print and cause a supply chain blip while this is fixed if it has not been fixed already.
As a quick note, QSFPTEK said that they would update their modules, but we were unable to get an updated unit to test. If we do, and if we get other modules to test, we will update this buyer’s guide with the new units.
Overall, our takeaway is essentially very simple: buy based on price. Prices change from day to day but it seems like the performance and power consumption are very similar. The one criteria we would use as a filter is the ability to negotiate links at 2.5GbE and 5GbE speeds. This is not an issue if you are buying a few of these units and know they will be on 10Gbase-T links, but if you are buying spares in the event you will need them later, getting units that are more flexible around the same price seems to make sense. Overall, there was a lot less differentiation than the pricing would seem to indicate here. Again, get the least expensive module you can since that seems to be the biggest value driver here. If you are unsure, check out our in-depth reviews to see more information on markings.