LAN speed will not go above 10 Mbps (even with new NIC that works elseware)

mix999

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Jun 5, 2013
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Hello, I have literally searched everywhere possible and debugged everything I could and cannot for the life of me figure it out.

I have a computer that I run as a home file server and recently I noticed that file transfer speeds on the local network are only 1.3 MBps (10 megabits) when they used to be around 12 Mbps (100 megaBytes). I did all the standard debugging I could: Set the connection speed manually, un-install and re-install drivers for my motherboard, even re-installing windows didn't help. Today I finally went out and bought a new NIC (Intel (EXPI9301CT) Gigabit CT) to see if that would work and I still only get a 10 megabit connection. This is crazy as the card works perfectly in my other computer and so do all the devices on my network (even a 6 year old low end laptop connected at 100 megabits). Is there anything that I haven't done because none of this makes sense to me.

Here are the specs

AMD athlon II X2 250
ASUS M4A88TD-V evo/usb3
2gb DDR3
Win 7 64bit

Router: d-link DIR-655

Any help would be greatly appreciated. Thank you.
- mix
 

mix999

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Jun 5, 2013
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I have attempted to use every port and cable I have and windows says that the speed it 10 mbps, I have tried setting the physical speed manually and that doesn't work.

 

choucove

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May 13, 2011
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A limitation to 10 Mbps speed is usually due to a cable or network device issue. Its possible the ethernet cable between your router/switch and your computer is actually a 10BaseT compatible only cable, which has fewer wires than standard Cat5/e and cannot carry a faster signal. It's also possible with some basic or older routers/switches to configure ports to operate only at 10 Mbps if it cannot auto-negotiate the link with the other end.
 

mix999

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Hey, Just so everyone knows the solution was the cables. We make all of the cables in out house aside from a few using a standard crimper. It seems like the quality of the crimper or head was bad and the cables that we made would not go above 100mbps. Turns out a couple of store bought ones and only ONE that we made works at 1 Gbps. So everyone, when you get/buy a cable plug your computer directly into the router and make sure its quality is up to par!