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Help me justify a gigabit switch

On an SBS 2003 R2 network with 9 desktops, it's connected with a several year old dell unmanaged 16 port 100baseT switch.

I am betting that it can't hurt to replace that switch with one that has at least 1 Gigabit port (the server would go on that).

The server has a gigabit nic and if I use task manager, I can see networking top out at 10% once in a while.  But then it scrolls off the screen.  

How would you go about seeing that it's maxed out x% of the time or some other justification that a gigabit switch would help the throughput for all the machines?

thanks!

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Lee W, MVP
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leew - Iwhen I say 10%, I am meaning the chart for that nic, which is gigabit, is 1000 at the top.  and it's topping out at 10% or so (100 MB - it' can't get above 10% because the switch is 100 MB -the weakest link in the chan limits the fastest speed?
pete - no one is complaining because they don't know better?  They try to open quickbooks, it taks 10s of seconds.  BUt it does also on my locally installed QB with a smaller database - just the bloat of QB.  I could justify it as maint, but I'd also like to know quantitatably that it will help.
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Here's an image of the network graph from taskmgr.  While it doesn't show any peaks at 10% on the LAN on this chart, it does substantiate my thinking that 10% on the LAN chart would be 100 MBit, right? and that would be the limit on a 1 gb NIC connected to a 100 mb switch?
Network.bmp