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kevinloh

My network consists of a Gigabit Router and two PCs with 1Mbps Broadband Connection.

One of the PCs network adapter has its Link Speed set to Auto Negotiation and gets 1Gbps link speed with a download speed of 120KB/s

The Second PCs is also set to Auto Negotiation and displays the 1Gbps Link Speed however downloading files at only 6KB/s. Setting the Link Speed Manually to 100Mbps will yield the proper download speed.

My question is why on one computer the speed is fine at 1Gbps Full Duplex while the other does not even achieve close to the speeds of the other PC.

Cabling does not seem to matter.

Thanks
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Mr T · Posted: Tue Jan 01, 2013 1:35 am Post subject:

Are the machines identical in the case of hardware and operating system? You are using cat 6e cable on both systems? It could be down to laod balancing, ie one system is hogging bandwidth reflecting on the others slow speed. My Gigabit network rarely runs at full speed due to so many networked devices (Xboxes and the like)...
_________________
I have been programming on computers since the ZX81.
I am an apprentice trained Electronics Engineer with qualifications to back it up.
I have been repairing computers since 1996.
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kevinloh · Posted: Tue Jan 01, 2013 4:41 pm Post subject:

The machine are not identical however disconnecting the other PC and using only one PC also yields the same story. Whenever I set the link speed on PC2 to auto or 1gbps auto negotiation transfer speeds drop significantly regardless of WAN or LAN connection. I don't think it is a cable issue.

Any more suggestions?
_________________
GIGABYTE GA-X79-UD3
Intel 3930K 3.20Ghz O/C to 4.0GHz
PHANTEKS PH-TC14PE CPU Cooler
16GB CORSAIR DDR3-2133 LP
SAMSUNG 830 256GB SSD SATA3
12TB HDD Drives
EVGA Nvidia 2GB GTX680 Superclocked Signature 2
CORSAIR AX1200W PSU
Sharkoon T28 Green Edition Case
DELL 22 Widescreen LCD Monitor E228WFP

Karlsweldt · Posted: Wed Jan 02, 2013 11:15 am Post subject:

Same AV/firewall program and settings? If not, then the AV/firewall limits may need 'adjusting'. You have to set "trusted" connections manually for full-speed Intranet or Internet use, if certain IP addresses are 'black listed'.
Ensure the browser security settings are identical on both systems. Reset to default, then "medium-high" for best protection and data speed. And block any third-party cookies!!! evil

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bdub · Posted: Wed Jan 02, 2013 1:45 pm Post subject:

updated network driver for the slower computer, maybe?

what kind of transfer speeds do you get sending files between the two computers?

how long are the cable runs to each computer, can you switch the cables?
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Hardware Junkie · Posted: Thu Jan 03, 2013 7:23 am Post subject:

I have actually seen this from varying network chipsets, SIS performing worse than an Intel for instance. You could be running into something similar. And unless you buy a decent network card, you might not be able to see a better result.
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kevinloh · Posted: Sat Jan 05, 2013 9:37 am Post subject:

The network adapter on the affected PC is Integrated Intel Network Adapter which is on a enthusiast GIGABYTE GA-X79UD3 motherboard (sig below) I am pretty sure my computer systems is more than capable of 1Gigabit/s transfer speeds.

Copying files between computers are slow when the affected PC is set to 1Gbps or Auto Negotiation. Setting it to 100Mbps yields better results.

I tried exchanging the cables and turning off any firewall but still the same issue.
_________________
GIGABYTE GA-X79-UD3
Intel 3930K 3.20Ghz O/C to 4.0GHz
PHANTEKS PH-TC14PE CPU Cooler
16GB CORSAIR DDR3-2133 LP
SAMSUNG 830 256GB SSD SATA3
12TB HDD Drives
EVGA Nvidia 2GB GTX680 Superclocked Signature 2
CORSAIR AX1200W PSU
Sharkoon T28 Green Edition Case
DELL 22 Widescreen LCD Monitor E228WFP

bdub · Posted: Sat Jan 05, 2013 2:20 pm Post subject:

look on the gigabyte site for a network driver, or find out what chip the nic is and go straight to intel for it.

http://www.gigabyte.us/products/product-page.aspx?pid=4050#bios
f8 bios has "improved lan performance" as a description.
_________________
my main rig...
asrock 970 extreme3
AMD athlonII X3 440
zalman cpns5x performa hs/fan
crucial ballistix 2x4gb sport ddr3-1333
powercolor 3850 256bit/512meg vga
antec neo he 650r
kingston hyperx 3k ssd 120GB
seagate 500GB HDD 32M cache
seagate 750GB HDD 32M cache
hitachi 1TB HDD 32M cache
lg wh14ns40 bd burner
optiarc ad-7240s sata dvdrw (nec chipset)

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