The options you are looking for are available from Device Manager in the Link Speed tab of the advanced adapter properties. There you can set up link speed and duplex and even run some diagnostic tests.
I wonder how you are measuring the speed. I recommend you setting the Intel® NUC in peer to peer with a known working system and transfer some files between systems. I recommend you testing with the Windows* 8.1 system since Server operating systems are not supported with Intel® NUCs.
Have already done this, checked all settings, etc. All diagnostic test show okay. Ethernet speed still appears to be 100MB/Fast type ... NOT GB.
Please note that the Advanced BIOS settings on the NUC have an Ethernet setup section for boot and it DOES NOT include full duplex/1000 setting.
The way measuring speed is to copy large >5GB file in a peer-peer type configuration. Looking at file transfer rate and time needed to copy.
Both NUC units tested with Windows 8.1, all updates applied, all latest drivers installed from Intel. (Server 2012 R2 Essentials also works fine and shows the exact same results)
File transfer rates:
Intel NUC (1) - 11MB/s
Intel NUC (2) - 11MB/s
"Older' computer with Realtek PCO GBE Family Controller exact same network, same port, same cable, etc.
Realtek PCI GBE - Abit IP35 Pro MB - 60MB/s
Newer systems show speeds ranging from 70-110MB/s on the exact same connection and this is what would be expected in real world performance. There is something wrong with the NUC Ethernet, it is at least 5X SLOWER than it should be.
I am, more or less, the same problem with the I218-V.
Have a Intel NUC D54250WYK, windows 7, that only gets 10 MB/s to my NAS whereas my PC, windows 7, gets 60 - 100 MB/s.
Installing the intel PROset drivers advanced options doesnt work (that is, when I configure the adapter it gives me errors when trying to adjust link speed). So I am stuck with a connection that shows as 10 mbps, throws errors and freezes when PROset advanced options are installed and performs as at 100mbs instead of gigabit.
This the same as I have found and as of yet cannot correct.
Mutiple NUC products - 10-11 MB/s file transfer rates over a Gigabit LAN connection
Switch to another Windows PC with Gigabit Ethernet and 60 - 110 MB/s. ... This on the same network, same source and even the same connection.
The NUC looks like it is operating as Fast Ethernet and not Gigabit.
Again, All NUC BIOS and driver updates installed, Network adapter manually set to Gigabit with full duplex!
Something is wrong here ... it happens on 3 different NUCS all purchased in the last 3 weeks.
Otherwise the NUC units have been fantastic.
No ... all other Gigabit Ethernet based systems behave fine. That is 5 other systems plus.
It is only the NUC units that show this slow connection/transfer behavior.
It is also interesting to note that in the Advanced BIOS setup on the NUC units for the network wakeup/boot connection a Gigabit full duplex option is not even available in the selection choices ... ?
I'm not suggesting the router is bad, just that it's worth a check.
I agree with Jason; it could be configuration, frame/packet size, etc. Hence my suggestion about testing peer to peer...
It includes some troubleshooting suggestions.
The router is not bad, the switch is not bad
This has been tested over and over ... peer-peer, putting the NUC in the exact LAN/cable slot as other machines that work fine, manually checked all NIC settings (the default should work fine if was good) ... nothing changes. And again ... there are now 3 brand new NUC units with all the latest updates and they all show transfer rates in a gigabit network of ~11MB/s vs. 60-110MB/s for other Gigabit Ethernet systems. 5-10X slower than it should be.
Something is wrong and all the NUC units show the exact same problem ...
Again, I'm not saying the router is bad. I'm saying it's worth trying the NUCs on a different router to see if you get a different behavior. It's entirely possible the problem is with the NUC's network card/driver not working well with that particular router. If you've only ever tested them on this router (or even this MODEL of router) then checking another router to see if they behave differently would be worthwhile.
Let's be clear ...
When you test with a switch, there is no router in the equation. So changing the "router" does absolutely nothing.
The router is a router ... not a router/switch (Ubiquiti Edge Router Lite)
I did change the switch just for grins and all is the same. DLInk pro and Netgear pro lines.
When I used the word "router" it was because I wasn't sure if you were talking about a router or a switch, or a switch connected to a router. If you've already tried another switch then great...you gave me the impression that you hadn't. My intention wasn't to offend you, I was honestly trying to help troubleshoot the problem. I have the same model NUC (and have worked with many of them) and haven't seen this issue on them.
I'll bow out and let you work with the official Intel support folks. They should be able to help.
Had one computer on the network using a FAST Ethernet connection, removed it and all now works fine with the NUC products.
Transfer rates went from 11MB/s to 80-90MB/s ...
Why this only impacted the NUC systems I am not sure. There were 6 hard wired units and only the NUC systems displayed this behavior.
I am plagued by something similar.
D54250WYK unit with W7 and all drivers up to date (19.3) and latest bios (028).
I'm duplicating a NAS directly onto another NAS and get +-30MB/sec from my NUC.
When I duplicate it through my desktop I get between 70 and 108MB/sec.
All devices are Gigabit, no Fast adapters anywhere, all hooked up to 1 TP-Link Gigabit switch.
Cables have been tested as fine since the desktop can both read from and copy to both NASes and the NUC at full Gigabit speed.
It seems that the NUC has GREAT issues with doing the transfers itself.
If I use the NUC to write to the desktop or NAS the transfer has a LOT of spikes between 20MB/sec and 70MB/sec and the CPU usage spikes all over the place as well on all cores. When I abort the transfer the NUC writes what it still has in buffer to the desktop or NAS but does so at a nice flatlined and maxed out 106MB/sec with CPU use at a steady 56%.
When reading from the desktop or the NAS it spikes between 8MB/sec and 50MB/sec.
The NUC can't do the transfers but can only have it done to it. But why?? What can be done about it???