Slow internet speed on 1 of 2 wired desk top PCs

[NJuser1]

I have 2 PCs that sit next to each other and are wired to the FiOS router. Both are running WinXP Pro and are up to date. PC 1 gets 9.6 mbps up and down. PC 2 gets 22 to 30 mbps up and down. PC 1 is a more powerful up-to-date machine. After switching ports on the router and even changing cables, PC 1 shows NO improvement. I even disabled the firewall and AV program on PC 1. Is there something I can do on PC1 to improve speed? P.S. Fios was just installed last Wednesday, 10/19. I ordered 25/25 mbps internet.

[jmw1950]

I suggest you check the receive buffers on the slower machine. Inadequate buffering would be consistent with the issues you are reporting.

Control Panel>system>hardware>device manger>network adapters and look at the properties in the advanced tab.

The default buffering is not designed for anything like FiOS performance. I have XP pro on a relatively slow machine, and have 64 buffers, 48 transmit control blocks and coalesce buffers to 16.

 According to ndt.anl.gov, with that configuration I can get up to about 80mpbs. You may also wish to run ndt.anl.gov on both machines and see what it tells you. Pay particular attention to the information in  the statistics and more information tabs.

In this age of cheap memory, saving a few hundred kilobytes on buffer space is insane..

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[viafax999]

Did you run the Verizon supplied optimizer on the pc's ?