Well, somehow it's fixed: Since putting in the new Intel card, the transfer from the box dropped so badly, I couldn't even copy a snoop from it.
So I removed the dohwchksum line from /etc/system and rebooted. Then just to clean up a bit I disabled the onboard NICs in the bios. Now I'm still seeing the duplicate ACKs and the checksum errors from that client, but the transfers have sped right up. Video playback and all other copying from the server are now working again without any problems so far. Thanks to all that have contributed to this thread, it really did help me organise my thoughts. Matt
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