Gigabit trunking

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26 Nov 2005
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I'm planning on building a gigabit trunk between 2 PCs using a gigabit switch (Netgear GS108T). So by combining 2 gigabit connections I can transfer data at 2000mbps between the them.

I had planned on using 2 PCI gigabit cards in one of the machines, but doing a little research I've heard that the maximum speed of the PCI bus is 133mb/s which is shared between all PCI slots on a motherboard.

Now since 2000mbps = 238mb/s, am I correct in thinking that using PCI cards would limit the speed?
(2,000,000,000 bits / 8*1024*1024 = 238mb)

Maybe i've got my figures wrong here, i'm not entirely sure if the PCI bus speeds i've mentioned are right. Also the mobo and lan cards are PCI 2.2 (if thats any faster :confused:). Does anyone know if PCI will be the limiting factor in reaching 2gbps speeds?

If thats the case would I need to switch the motherboard to something with either 2 in-built gigabit lan connections or with 2 pci-e 1x slots (or a combination of the two)
 
reading elsewhere i've found: PCI 2.2 allows for 66 MHz signaling (requires 3.3 volt signaling) (peak transfer rate of 533 MB/s)

so maybe i'm ok?
 
I have never seen more than 60% (600mpbs) utilization on my gigabit link when transfering files, (5% when using vista :( )

If you are hoping to get 2000mpbs then the very best of luck to you!
 
I'm setting up a raid 6 NAS with 7 drives.
My raid 10 with 4 drives manages up to 110mb/s which equates to about 930mbps, so I expect this should do more :D
 
I have never seen more than 60% (600mpbs) utilization on my gigabit link when transfering files, (5% when using vista :( )

If you are hoping to get 2000mpbs then the very best of luck to you!

I agree, network speeds are never what they are on paper.
 
well i presume in m_cozzys case he doesnt see above 600mbps (71.5mb/s) because his HDD speed is limiting him (rather than the network)
...
unless hes using raid of course, which should go faster than that.
 
Sorry for the late reply, been swamped this week...

Anyway, since I was looking to build this machine as cheaply as possible I am using an old socket 939 cpu and ram I have laying around. This limited my options of motherboards somewhat though, but I opted for the Asus A8V-VM SE.
http://www.asus.com/products.aspx?l1=3&l2=15&l3=260&l4=0&model=1524&modelmenu=2

This board has 1 (16x) PCI-E port and 1 (1x) PCI-E port.
The reason for using an mATX board was that it had onboard video (saving me from buying a graphic card). I couldn't find any full size skt 939 ATX boards with onboard video.

I suppose I could try using 1 PCI-E network adaptor and 1 standard PCI adaptor. However, since I've already ordered everything now I think I'll just compare the speed differences across the network and locally on the computer and see if I need to change anything.

Worst case scenario I've lost £25 on the mobo and £10 for each network adaptor.
 
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