Gigabit internet speed not being achieved

I just had my Internet provider install gig Internet at my location. The speed tests ive done are saying I have 400-480mb.
I've tried both using a computer via the router and then plugging directly into the Internet without the router. Both gave the same result.
Both computers have gig NICs

Is there something else I can check or should I call the company?

Tia
NjacobeAsked:
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
Remember, a Gigabit is not a Gigabyte. 1 Gigabit is 0.125 Gigabytes, or 128 Megabytes.

If the gigabit NICs are attached via PCI bus they won't get real 1Gb download speeds because PCI bus has a maximum transfer rate of 133 MB/s while Gigabit Ethernet has a maximum of 125 MB/s (1.000 Mbps / 8 = 125 MB/s). Even with PCI express you're still limited as it only allows for 250 MB/s maximum transfer. Even USB 3 wouldn't get you there as it is capable of transferring data at up to 5 Gb/s (625 MB/s),

Gigabit Ethernet and internet should allow for 1 billion bits per second, but system limitations and fault tolerances greatly hamper those speeds. Everything that communicates throughout your system travels over the system bus, which has limitations based on hardware usage at that current moment. Application efficiency, compression, buffer contention, hard drive throughput, and on and on.

The only way to get "close" to actual 1GB / s download times would be to utilize FPGA cards that completely remove system bus traversing from the picture.

How Gigabit Ethernet Works - http://www.hardwaresecrets.com/article/231
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NjacobeAuthor Commented:
The throughput I should be getting is around the 900megabit range.  the onboard nic we order is business class 1gbit class. Internal testing shows lan speed well in the 900s.

The blade server in used to test the wan has a 10gbit card it should have no trouble getting move wan speed then I am currently seeing.
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NjacobeAuthor Commented:
ISP had an issue. The came out and replaced the Fiber box to the house. Speed is now as expected 900mb range. Thanks!
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NjacobeAuthor Commented:
Called the ISP after doing more troubleshooting.
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