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Yeah I'm scratching my head on this one too. I think it's common to see a slight decrease comparing FW to USB interfaces, but not nearly this much (~12%). No other peripherals plugged in. USB keyboard, USB mouse, and the Mbox itself, that's it. There's no setting in the BIOS for hi-speed vs. full-speed. It's just either on or off. I even did a full uninstall/reinstall of Pro Tools to see if adding the Mbox drivers on top of the Mbox 2 Pro drivers had anything to do with it. Same result.
I'd be curious about other Core 2 Quad builds comparing FW to USB interface results. Perhaps this is the one weakness of the P35 chipset?
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I'm on the road this week if I get through the house this weekend I will try my MBox mini on my Daw and see if there is any change in Dverb counts. while its not a Core 2 System I have never tried my MBox Mini on my windows machine. I'm kind of curious if there would be a drop in Dverb counts. I agree that a drop from Fire Wire to USB is probably not uncommon somewhere in the 3-5 range would be normal I would think.
I assume that if you plug in the Mbox2 Pro the Dverb count goes right back up? If I was at home I might be tempted to overnight my Mbox Mini to you see if the newer interface did better. I probably wont be home till monday though ;(
Maybe another Core 2 owner that has both Interfaces can run some test's?
it would be good to know if the P965's show the same hit with USB.