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Only 100Mbps on a Cat 6 - Page 3

post #21 of 22
I am haveing the same problem with my Rampage III Extreme and its onbourd NIC. i have tried everything. even used new cables. my other devices connect properly at 1Gbps. the intel nic on my board has a line t6est feature and it says my cable is over 255meters in length. but in reality it is very short. i wish i new how to fix this....
The Beast!
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The Beast!
(17 items)
 
  
CPUMotherboardGraphicsRAM
980 @4.6GHZ HT on Asus Rampage III Extreme ATI 5870 G.Skill F3-16000CL9T-6GBRH 
Hard DriveHard DriveOptical DriveCooling
OCZ Vertex 4 128GB x 2 RAID0 (Boot) Seagate Barracuda 7200.11 1TB (Backup) LiteON 22x DVD Zalman CNPS10X FLEX with Two DELTA 3500RPM Fans 
OSMonitorKeyboardPower
Windows 7 Ultimate Samsung 21.5" x 3 eyefinity Steelseries 7G CM 1000watt Silent Pro 
CaseMouseMouse PadAudio
Cooler Master Cosmos II Steelseries Kinzu V2 PRO Black Steelseries QcK Asus Xonar DX 
Other
Intel EXPI9301CT Gigabit CT Desktop Adapter 
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post #22 of 22
Boot up a Linux ISO disc. That should narrow it down to either a hardware or software issue.

Hardware issue:
If you don't have all 4 pairs connected, you will get 100 Mbps, but not gigabit.

Example:
I had a similar issue with a cable run in my house. Turned out that the normally unused blue wire (T568B) was severed at the punchdown. However, unlike in your case I got no connection at all after the PC was fully booted. During the boot sequence I had link lights at 100 Mbps, but nothing after. Plugging a 100 Mbps switch between the gigabit NIC and the gigabit switch caused the link to come alive. After realizing I needed all 4 pairs to use gigabit, I repaired the punchdown and got gigabit back.

Hope some of this helps.
SFG II
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SFG II
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OCZ Vertex 2 HITACHI Deskstar 5K3000 SAMSUNG EcoGreen F4 Linux Mint 12 
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