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[Immow]

As the topic states I can't get speeds above 15 MB/s, When I called customer support some time ago they said it was a problem with my motherboard and the compatibility with the router using Windows 7

My motherboard = GA-MA78GM-UD2H http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=3017

Now that windows 7 is no longer beta I was hoping if there is a solution to my problem?

[SanderT]

Where can't you reach these speeds?

1. Between connected PC's via the Router?
2. Between the Internet/WAN and your PC?

If 1, do both PC's have a Gigabit NIC/Capabilities? How do you measure the speeds? Do all connected PC's show a connection speed of 1Gb? Do you have a 1 Gigabit capable switch between your router and PC?
If 2, what is your internet connection speed and your modem type?

Cause 15MB/s sound like a 100Megabit connection (should be around 12.5 MB/s).. so maybe your one of other(!) your connected PC's or Modem has a max 100Megabit network connection. So devices connected at endpoints of the LAN and WAN have to be 1 Gigabit to get 1 Gigabit speeds between those devices. If you have a 100 Megabit max modem, you internet won't get faster than 15MB/s. If you have a three PC's, two with Gigabit connections and one with a 100Megabit connection, only transfering information between the PC's with the Gigabit connections will get you speeds above 15MB/s.

If above things don't apply to you, check if your connection speed indicates 1 Gigabit in windows, it COULD be a driver problem otherwise, but usually the 8111C network chip is supported perfectly in all windows versions. Go here for drivers: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false

[Immow]

Thank you for you detailed response, I think I found the solution!

One of my cables was quality of CAT5, I found this article explaining

Cat 5 and Cat 5e UTP cables can support 10/100/1000 Mbps Ethernet. Although Cat 5 cable may support to some degree in Gigabit Ethernet (1000 Mbps), it performs below standard during high-data transfer scenarios, so I do not recommend you to use Cat 5 cable in Gigabit Ethernet, use Cat 5e instead (of course Cat 6 is the best).

I plugged in my CAT5e cable instead of my CAT5 and my server has the same cable (cat5e) I get speeds now at a minimum of 70 MB/s

[Immow]

Weird discovery, don't know about this for 100%, when I tried a file later... speed was again 10 mb/s... So I tried setting my network adapter from auto to full duplex 1000 Mbps. Then windows 7 could not seem to get the connection back up... I had to remove/uninstall my device and install it again to get my connection back. Then when I tried sending a file to D:/ of my server it went fast.. then to my other drive it went slow again (same drives in that computer so speeds should be the same). Then to the slow one I re-sended the file. now the speed was good. Can this be something that has to do with power management (drive goes into sleep mode)?

[Immow]

hmm I have no idea what is wrong, seems that only a moment after the drivers are installed windows uses the proper speed and then it drops again...

[Immow]

It seems my lan led lights at my pc are Orange and Red (asus p5q deluxe motherboard)...

This indicates it can't detect gigabyte, i'l have to try a different cable..

GA-MA78GM-UD2H same for this motherboard, there is hope yet

[Immow]

The problem is solved!!, I have on both connected computers a CAT 6 UTP cable and I get proper speeds

[Fekalen]

Sometimes Cat.5 cables only contain 4-cables, not the necessery 8 for gigabit speed. Check the end of the cable and it should be easy to spot.
I have recieved some of these with cable and adsl-modems, throw them away or you can be sure of accidentally using them again.