Very Low performance Firewire

Hi
First.. sorry for Bad translating.
i notes very low performance of my FW800/400 (i think after EFI/SMC Firmware Update)
FW800/400 More slowly the USB2 and FW800 cannot see External Devices that working fine with my macbook pro.

Hey Noorldin,
I think I have a similar problem. I have always had some issues with the ports (owned the MacPro since the first month it came out) but several months ago things took a turn for the worse. External harddrives no longer work properly. USB drives won't mount, firewire drives will mount but the transfer rate is roughly 1MB a sec and after ~10 MB I get an error and the transfer stops. Other peripherals work for the most part but not well. My external usb microphone will not stop receiving audio signals when turned off and my canon HV20 drops frames during transfers. My awesome fujitsu scansnap scanner, printer, and usb mouse transmitter all work fine though. I used to be able to play many 1080p videos at the same time, now I can not play one without frames dropping even when booted into a new clean internal HDD. The MacPro will only sleep if I manually set it to sleep. The autosleep feature will have the internal hdds spinning up and down all night.
I spent 20 min on hold to get an Apple rep and then 47 min on hold to get an Apple Specialist. The specialist was very kind and tried many things with me. In the end, the specialist concluded that my Logic board or CPUs were most likely bad and that I should get them tested and possibly replaced. You may need the same.
One weird thing I tried just the other night was to unplug all USB and Firewire devices, including my 30 in display and wireless mouse hub, and then I plugged in just one firewire hdd. It worked fine!? So, I will continue testing on my own for a while and let you know what I find out from my tests or from the Apple repairs, as I have only seen one other person with an issue like mine and what I believe might be yours too. I have seen many issues with the front ports not working right though.

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