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bk T
16-07-2015, 12:20 AM
Performed speedtest (speedtest.net) on two different PCs both running Win8.1 x64. Both PCs are connected to the Router by Cat5e Ethernet cable (< 5 m in length) within a small room.

PC No. 1 achieved ~86 Mbps down whereas, PC No. 2 achieved only 46 Mbps down; upload speeds are about the same. All tests were using the same server.

Why is it so?

1101
16-07-2015, 10:02 AM
run more tests & take an average
perhaps the 2 pc's were doing the speedtests to & from different overseas 'servers'

bk T
16-07-2015, 11:34 AM
They are all using Spark Auckland server.

wainuitech
16-07-2015, 11:53 AM
By any chance is one of them also running through a switch ?

If I test here on the office PC its faster then the workshop or lounge. The workshop & lounge goes through a couple of switches which is where the "slowness" is.

Direct connection to the Router is 130 Mbps, where as Workshop /Lounge is 70 - 90 Mbps

bk T
16-07-2015, 12:20 PM
They are all connected directly to the Router.

Both PCs are freshly reinstalled Win8.1, fully updated.

dugimodo
16-07-2015, 12:59 PM
It's weird, not something downloading or updating in the background? You could try swapping ports to see if the speedtest changes.
Also do the test with only the one device running.

fnphoto
16-07-2015, 01:19 PM
Thinner wires? .. lol :rolleyes: ;)

Alex B
16-07-2015, 01:41 PM
Is there a newer NIC driver available?

Lawrence
16-07-2015, 01:47 PM
Has the slower one got the correct Network setting?, Both IP and DNS set to Auto

pcuser42
16-07-2015, 02:18 PM
At that kind of speed WiFi can affect the speed too. My tablet gets ~30 down on WiFi but jumps to the full 100 down if I use an Ethernet adapter.

inphinity
16-07-2015, 03:05 PM
Are the PCs identical spec?

bk T
16-07-2015, 04:35 PM
1. All machines fully updated including device drivers.

2. Both machines using 'Obtain an IP address automatically' , same DNS server: Preferred: 122.56.237.1 alternate: 210.55.111.1.

3. Older machine having Gigabyte X58A-UD3R i7 960 @3.20GHz 6GB RAM Win8.1 Pro x64bit --- achieves HIGHER download speed. :)

4. Swapped Ethernet cable, Router ports.

5. Newer machine having Asus Z97A i5-4690K @3.50GHz 8GB RAM Win8.1 Pro x64bit. -- achieves LOWER download speed. :(

I would expect the newer machine to get higher speed rather the other way around!

Alex B
16-07-2015, 05:16 PM
Has it got the Intel NIC? If so are you using drivers from Intel or ASUS's site?

bk T
16-07-2015, 09:47 PM
Yes, Z97-A has Intel NIC. Installed driver from Asus site- latest available driver.

bk T
16-07-2015, 10:07 PM
Only thing I didn't install is Asus Turbo LAN as quite a bit of negative feedback on the Internet.

Do you guys reckon I should install the Turbo LAN?

DeSade
16-07-2015, 11:50 PM
Uninstall ASUS drivers and install Intel drivers for the chipset.

Alex B
17-07-2015, 12:58 AM
Yes, Z97-A has Intel NIC. Installed driver from Asus site- latest available driver.

The driver available from intel download site is version 20, where yours is version 19. Give it a try.

bk T
17-07-2015, 09:31 AM
Just replaced the Asus driver with Intel's, tested with same results.

zqwerty
17-07-2015, 01:10 PM
"tested with same results"

Does this mean: the problem is now resolved, as in, they both get the same speedtest results after the last changes you made,

OR

You are still getting the same results as when you first posted the problem?

bk T
17-07-2015, 02:17 PM
A bit of confusion here. Same results as previous tests - no change.

wratterus
17-07-2015, 02:32 PM
This is seriously weird. Only two ideas - try a PCI-e NIC and see what the results are

Have you ever used iperf before? It's a command line based speed testing program. You could use it to run tests between the PCs and see what speed you get - that could rule out a NIC issue. OR maybe point to something else. If you connected the PCs together, or through a gigabit switch and ran some tests, you should see hopefully around 900Mbps which would rule out the NIC.

https://iperf.fr/

bk T
17-07-2015, 02:56 PM
wratterus, I never used iperf, just downloaded the zipped file.

How do I use it?

wratterus
17-07-2015, 05:08 PM
It's a lot less complicated than it looks haha.

Open a command prompt and drag the .exe file you extracted into it on both PCs.

On the PC you want to be the 'server', type iperf.exe -s

On the 'client PC' type iperf -c then the IP address of the server PC, for example 192.168.1.5

Then hit enter and it will run a test - you can do a bunch and it will show you the results.

This is the output I get running iperf between two PCs on a gigabit network here.



[ 4] local 192.168.1.35 port 5001 connected with 192.168.1.27 port 50304
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 915 MBytes 765 Mbits/sec
[ 4] local 192.168.1.35 port 5001 connected with 192.168.1.27 port 50307
[ 4] 0.0-10.0 sec 878 MBytes 734 Mbits/sec
[ 4] local 192.168.1.35 port 5001 connected with 192.168.1.27 port 50310
[ 4] 0.0-10.0 sec 920 MBytes 769 Mbits/sec
[ 4] local 192.168.1.35 port 5001 connected with 192.168.1.27 port 50311
[ 4] 0.0-10.0 sec 760 MBytes 637 Mbits/sec
[ 4] local 192.168.1.35 port 5001 connected with 192.168.1.27 port 50316
[ 4] 0.0-10.1 sec 894 MBytes 746 Mbits/sec
[ 4] local 192.168.1.35 port 5001 connected with 192.168.1.27 port 50318
[ 4] 0.0-10.1 sec 904 MBytes 755 Mbits/sec

Kame
17-07-2015, 09:05 PM
Quite little information on the network side of things but how can an i5 be considered newer than an i7?

Although internet speed should not be that far apart, hardware can result in lower speeds, but not by half.

I'd be messing around with the drivers, forcing fixed speeds etc. Not sure what your network speed actually is, although i assume its all gigabit network.

I would even boot from a linux live cd/usb and run the test, if the results are still the same, then its probably something hardware.

Cheers,

KK

wratterus
18-07-2015, 01:16 PM
i3, i5 and i7 have been around for several generations now. There are heaps of i5 processors that are newer than i7s.

For example I have an i7-860 - one of the original 1156 socket ones.

A brand new i5-4690K is about 4-5 years newer, and also actually more powerful.

OP - did you get a handle on iPerf?

bk T
18-07-2015, 03:47 PM
No. Still couldn't figure out what will that achieve?

Alex B
19-07-2015, 03:54 PM
Does the desktop with the slower performance have Wi-Fi at all? If so is it disabled?

bk T
19-07-2015, 05:24 PM
No. it has only LAN.

wratterus
20-07-2015, 10:08 AM
The idea with testing with iPerf was to see if the issue still occurs with standard network traffic - totally excluding the internet connection.