Slow internet downloads to clients

I have an SBS 2003 R2 installed on a Dell poweredge 2950 (Dual processor, Dual embedded NICs) with 2 NICs; ISP is Comcast (Cable); 3 Switches: 2 Dell PowerConnect 2724 (1Gb), and 1 Cisco 2790 (100 Mbps); Aproximately 45 devices on the network. I am having slow internet downloads to the clients.
I have ran onlines speed tests (speakeasy) and I saw download speeds at the server of 8Mb but the clients can only download at 172Kbs (same speed test site). I have checked that no one is doing any streaming on the network, and checked the DNS settings of my SBS install. Switches are unmanaged swtiches, and when I run a throughput test from client to server I get the speed of the NIC (ie. 1Gb from workstations with Gig NICs or 100Mbps for 100 NIC). Comcast has already replaces the modem/router on my request, and I have downloaded and installed the latest NIC drivers from Dell.
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MoSBSAsked:
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NOSITCommented:
Does it happen through all the switches? or just clients connected through 1 switch? It could be config in one or all of your switches to ensure that 1 user doesnt use all the bandwidth.
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MoSBSAuthor Commented:
Thanks!
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