2 identical computers 1 ethernet cable 2 different ethernet speeds

[Jakob Stensig Olesen]

Hey all..

My ethernet speed is very different from 1 pc to another 1. It is the same cable and it is 2 identical MCB pro but i get 2 different speeds. The one can get 145Mbit and the other only 90Mbit. I got a 150/15 broadband. So what can the problem be. ???

 

[USAFRet]

On the second MCB pro, somewhere in the chain of devices to the router there is a 10/100 device. Or bad drivers. Something is restricting it to 100Mbps.

 

[Jakob Stensig Olesen]

On the second MCB pro, somewhere in the chain of devices to the router there is a 10/100 device. Or bad drivers. Something is restricting it to 100Mbps.

i tried to use my other pc. It is another cable but that is also only at 94Mbit. And the Ethernet card supports up to 1000Mbit. :/

 

[USAFRet]

Some device in there is restricting it to just below 100Mbps.

PC 1 gets the max speed of ~150Mbps
PC 2 gets ~100Mbps.

Have you swapped the cables (with no other changes) between the two and see if the problem follows? Or does the issue stay with PC 2?

 

[Jakob Stensig Olesen]

Second MBP got ~ 100Mbps on both cables.. and First MBP got ~ 150 on first cable and ~ 100Mbps on second cable.

 

[USAFRet]

Second MBP got ~ 100Mbps on both cables.. and First MBP got ~ 150 on first cable and ~ 100Mbps on second cable.

So:
With the first MBP, the problem follow the cable. That would indicate some issue with the cable, or that particular cable connects to some 10/100 device in the middle.

However...adding in the second MBP only getting 100Mbps with either cable - that indicates an issue with that particular computer. LAN adapter or driver.

 

[Jakob Stensig Olesen]

but with a third computer on both cables.. That pc does also only get around 100 Mbps on both.. so how can the 1 computer reach 150Mbps as the only one, when all 3 pc's support over 150 Mbps. Third Pc is Windows

 

[USAFRet]

Where are you testing this speed?

 

[Jakob Stensig Olesen]

On several speedtests.. 1 of them Speedtest.net

 

[USAFRet]

Is this essentially correct?

 

[Jakob Stensig Olesen]

yes

 

[USAFRet]

Then that would indicate there is an issue with Cable B, and PC 2 & 3.

From Cable B...is that a straight shot to the router? Nothing in between?

 

[Jakob Stensig Olesen]

nope.. Both cables are right from pc to router.. the cables are both around 20 meter

 

[USAFRet]

Then that would indicate there is an issue with Cable B, and PC 2 & 3.

From Cable B...is that a straight shot to the router? Nothing in between?

nope.. Both cables are right from pc to router.. the cables are both around 20 meter does it matter?

Assuming good quality cable, 20 meters is fine. I've asked the collective Moderator mind. Let's see if that have any insights.

 

[Jakob Stensig Olesen]

okay

 

[ex_bubblehead]

Next step, swap the two cables between ports on the router and retest.

 

[Jakob Stensig Olesen]

doesn't help

 

[ex_bubblehead]

doesn't help

What specifically didn't work. We're trying to see if the problem follows the port or the cable. Record your results as above and report.

 

[Jakob Stensig Olesen]

I switched the cables at the router and the speed Didnt change the speed only a little bit.

 

[ex_bubblehead]

Did the 150 change from one cable to the other when you did this? That's what we need to know. Did the one that was running faster switch to the other side or not. Nothing else matters at this stage.

 

[Jakob Stensig Olesen]

the MBP had 150 on cable a and 100 on cable b

 

[Jakob Stensig Olesen]

the 1 thing that is anoying me most is that the first computer can have 150 on 1 cable and not on second cable.. cables are fully identical.

 

[ex_bubblehead]

the MBP had 150 on cable a and 100 on cable b

And after you swapped the cables at the router?

 

[USAFRet]

the MBP had 150 on cable a and 100 on cable b

And, if at the router, we switch from Port 1 to port 2?
The issue stays with the PC, or with the cable and port?

 

[Onus]

Is this a wireless router, and is there any wireless device attached (possibly including an unwelcome leech)?
Traffic will slow to the slowest device, and it could possibly be something wireless.