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would this pci card work in my mac pros 4x pci card slot and if so would it be faster to put it into the 16x slot
http://www.newegg.com/Product/Product.aspx?Item=N82E16815106007

how about this fan for better air flow

http://www.newegg.com/Product/Product.aspx?Item=N82E16835888309

1. That card wouldn't work in a Mac Pro because it's a 32-bit PCI card and not a PCI Express card (the slots are completely different). To answer your other question, a PCI Express USB card would operate no faster in a 16-lane slot than it would in the 4-lane slot. In fact, that's a total waste of a 16x slot that you could be using for a second graphics card or a hardware RAID card later on.

What USB devices are connecting? You'll probably do just as well with a USB hub if you need more ports, unless some of those devices are hard drives (which really should be running in Firewire anyway).

A card like this works with a Mac Pro.

2. In my experience, the stock fans in the Mac Pro do a more than adequate job at keeping everything cool. Keeping a system cool is a lot more than just adding fans - the internal design of the enclosure and how it distributes the air is also very important.
 
thanks very much...at the moment i have a wd drive thats usb 2.0 but i would love to make it firewire 800. its a 7200rpm 500g drive that im using for time machine. Can i just get a firewire 800 cable and plug it in or do i need to get a new drive? Can a 7200rpm drive take advantage of firewire 800?
 
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