Slow speed with LAN connection. Problem or just old?

[Siegfriedm]

I have a VDSL connection since 2 days, and ignoring the general slow speed, I would like to know why if I connect my PC to the modem (Dlink DVA 5592) via Ethernet cable, the speed is half that I have if I connect it via Wifi.
It's about 20-25 Mbps with the yellow cable, and 45-50 via Wifi.
My motherboard is an AsRock Z77 Extreme 4, and I use the integrated adapter on it, Broadcom NetLink Gigabit Ethernet. See the pic below.
How can I resolve this? I would like to connect my PC to the modem via yellow cable, and have same speed than Wifi.

 

[das_stig]

Go into the Broadcoms properties and switch link speed from auto to 1000 Full Duplex, this will ensure NIC is running at top speed. AFter that ensure your using a good quality CAT5E network cable.

 

[nigelivey]

Go into the Broadcoms properties and switch link speed from auto to 1000 Full Duplex, this will ensure NIC is running at top speed. AFter that ensure your using a good quality CAT5E network cable.

That's not accurate. If you can not set the duplex and speed withing the modem both sides of the connection should be left on auto. One side on auto and the other on 1000 FD will cause issues. This is more likely a cable problem.

 

[Siegfriedm]

Go into the Broadcoms properties and switch link speed from auto to 1000 Full Duplex, this will ensure NIC is running at top speed. AFter that ensure your using a good quality CAT5E network cable.

Do you mean Advanced > Speed & duplex? Well, it's set on Auto, and the max speed available is 100 Half or Full duplex, not 1000.
So, I guess the problem can be the integrated chipset, to be not so fast. Is there any decent and good priced PCI adapter?

EDIT: Setting 100 Full Duplex, makes it way faster. Now it's about 80-85 mbps.

That's not accurate. If you can not set the duplex and speed withing the modem both sides of the connection should be left on auto. One side on auto and the other on 1000 FD will cause issues. This is more likely a cable problem.

The cable is the one included with the modem. It's pretty short, as the distance from the modem to the pc, about 1 and half meters. And, also, I tried with another cable as well.

 

[nigelivey]

Go into the Broadcoms properties and switch link speed from auto to 1000 Full Duplex, this will ensure NIC is running at top speed. AFter that ensure your using a good quality CAT5E network cable.

Do you mean Advanced > Speed & duplex? Well, it's set on Auto, and the max speed available is 100 Half or Full duplex, not 1000.
So, I guess the problem can be the integrated chipset, to be not so fast. Is there any decent and good priced PCI adapter?

That's not accurate. If you can not set the duplex and speed withing the modem both sides of the connection should be left on auto. One side on auto and the other on 1000 FD will cause issues. This is more likely a cable problem.

The cable is the one included with the modem. It's pretty short, as the distance from the modem to the pc, about 1 and half meters. And, also, I tried with another cable as well.

It's a gigabit adapter (1000), have you tried uninstall the adapter and letting windows find drivers? Failing that I always use Intel cards.

 

[Siegfriedm]

It's a gigabit adapter (1000), have you tried uninstall the adapter and letting windows find drivers? Failing that I always use Intel cards.

Yep, it installs the same driver. What is an Intel card? Can you link me one, or just say me some model?

Ok, maybe I found something on Amazon italy. Something like I210-T1 GbE NIC or EXPI9301CTBLK PRO1000 ?

 

[nigelivey]

It's a gigabit adapter (1000), have you tried uninstall the adapter and letting windows find drivers? Failing that I always use Intel cards.

Yep, it installs the same driver. What is an Intel card? Can you link me one, or just say me some model?

Ok, maybe I found something on Amazon italy. Something like I210-T1 GbE NIC or EXPI9301CTBLK PRO1000 ?

Amazon Intel Pci gigabit network adapter........ Don't be lazy!!!!

 

[Siegfriedm]

It's a gigabit adapter (1000), have you tried uninstall the adapter and letting windows find drivers? Failing that I always use Intel cards.

Yep, it installs the same driver. What is an Intel card? Can you link me one, or just say me some model?

Ok, maybe I found something on Amazon italy. Something like I210-T1 GbE NIC or EXPI9301CTBLK PRO1000 ?

Amazon Intel Pci gigabit network adapter........ Don't be lazy!!!!

Yeah, thanks, and the first result for that research is one of the two model I said before.

 

[bill001g]

It is very rare for a integrated adapter to fail. Most times they just do not work at all if you get a failure. Before you spend a lot of money buy a new cable from a reputable dealer. These problems are almost always cable problems. There is a lot of crap cable on the market. Those flat thin cables and cable that is not pure copper are all over the market but are not certified cables and cause strange issues for many people

 

[Siegfriedm]

Well, this is odd. I bought a new LAN adapter, the Intel one. I set it to 1gbps full duplex, and it's slower than 100mbps full duplex.

 

[bill001g]

Well, this is odd. I bought a new LAN adapter, the Intel one. I set it to 1gbps full duplex, and it's slower than 100mbps full duplex.

nigelivey pointed this out in the second or third post on this thread. You MUST leave the port setting AUTO. If you set anything else it disabled the negotiation and the router side will not set the port correctly in most cases.

In addition there really is no concept of full and half duplex on gigabit. It always transmit and received on all 4 pair on both ends at the same time. It works very differently than 100mbit where you have transmit and receive pairs. Setting duplex on a gigabit connection messes things up on some devices.

If setting it to auto does not fix this and you have tried a different nic card and a different cable then something is very messed up with your PC.

 

[Siegfriedm]

I confirm. Only 100mbps full duplex gives me high speed.