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gig NIC but only 100Mbps

Posted on 2015-01-26
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Last Modified: 2015-01-27
My PC has a gig NIC card but when I checked LAN Networking  performance in Win Task Manager, it only shows 100Mbps. Is there a way to get the correct setup for the NIC? Thx
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Question by:leblanc
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by:Larry Struckmeyer MVP
Larry Struckmeyer MVP earned 167 total points
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In the properties of the NIC what is the connection setting?  Auto-negotiate would produce the result based on the negotiated rate between the two systems.  of course there are other possibilities such as the switch or the wiring limiting the connection speed.
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Lee W, MVP earned 333 total points
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As Larry says, there are a lot of reasons you might not be getting gigabit speeds.
* Does the switch you are connected to support gigabit?
* Is the cable you are using Cat5e or better? (Cat5 is not sufficient in most cases)
* Did you (or someone else) at one time change the driver settings from auto-negotiate to 100 Mbit?

Even if you can get gigabit speeds to the switch, will it matter?  If your internet connection is 50 Mbit (FiOS, for example), then 100 or 1000 Mbit won't make a difference.
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by:Predrag Jovic
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If you are sure that your switch (other end device) support 1Gb and that cables are OK.
Go to network and sharing center - change adapter settings - right click on you adapter - properties  -> configure button - advanced tab - among properties there is SPEED AND DUPLEX, choose 1Gb full duplex.
Auto-negotiation does not always work well.
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by:leblanc
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- the switch ports are all gig with full duplex.
- Wire cat5e... That I am not sure. I will need to find out.
- I did manually change to 1gig full and I got disconnected and nothing works.
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by:Lee W, MVP
Lee W, MVP earned 333 total points
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Sounds like you have Cat5 cable and not Cat5e.  Also, make sure some idiot didn't split the wire.  I have one client I picked up a while ago who had their building wired by idiots - Cat5 is an 8 wire cable - so to "save money" or something, they decided to SPLIT the cable, 4 wires to one plug, 4 to another.  10/100 only requires 4 wires.  Gigabit requires ALL 8.  Check that the cable is good too - if it was a manually made cable, it's possible one of the pins at one end isn't properly crimped and if that's the case, it can't negotiate without all pins in good order.
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by:leblanc
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Yup. It was cat5. Need to rewire. Thanks
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