Asymmetric UL/DL on gigabit LAN?

Hi all,

The local network hardware in question:
CAT5E cabling
Netgear WNDR3700
Gigabyte Z77 (A) and MSI Z68 (B)
Windows 7 Ultimate x64 SP1 on both

I can upload from (A) to (B) and saturate 100% of my bandwidth (120+ MB/s). The other way round though, only ~60% of the bandwidth is used (~70MB/s). Test done using 15GB ISO and Windows copy.

Already ensured the following settings are same on both:

Energy Efficient Ethernet: Disabled
Jumbo Frame: 9Kb MTU
IPv6: Disabled
QoS: Disabled
Autotuning: Disabled
Speed & Duplex: 1Gbps Full Duplex
Large Send Offload: All Off

Can someone help me out here please?

Try running AS SSD benchmark on the partitions that you are uploading to.

These are new 4TB WD Reds, 5400RPM. Their performance stats check out just fine.

(Shouldn't affect much but) Same AV on machines?
Perhaps a cable with a faulty wire? What does the network connection property page (network and sharing center - local area connection) show as connection speed?

Both use the built in Firewall and Microsoft Security Essentials, nothing else. Task Manager reports the network connections as 1Gbps.

Switch the cables around if possible or try a different cable for the problem PC.
I would also try a direct connection between the computers. Gigabit ethernet cards can communicate like that.

Hi, do you mean just turning the cable around or swapping it out? The latter's not really possible as it's the only 10m cable I have. Its routed through the house so anything to do with the cable is troublesome if I'm honest.

I could try a direct, to rule out issues with the router. The cable was newly installed 2 months ago and back then I had no problems saturating the bandwidth both ways.

I guess a direct should suffice, if you get the same deal then swap the 10m cable around (if possible). As in PC A end to B, and PC B end to A.