Tom's Hardware > Forum > CPU & Components > Other Components > USB and Firewire
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raylee011   10-17-2001 at 09:31:25 PM

What is the different between USB and Firewire (i.Link Connection) , speed?

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Crashman   03-17-2002 at 11:19:05 AM
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Firewire is something like 40 times as fast as USB.

What's the frequency, Kenneth?

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Rob423   03-17-2002 at 05:31:44 PM
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what is the differnce between the Different USB 2.0 or 1.1 what ever the #'s are... would there be any Compatability problems or conflicts with anything

Once you go AMD, You never Go back!!

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Vince604   03-17-2002 at 08:52:35 PM
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hmm would it really be possible to use Firewire at 40 times or however faster it is? What bout SCSI and Firewire? What's the difference there?

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Crashman   03-17-2002 at 10:26:16 PM
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USB 2.0 is about the same speed as Firewire, these standards are cross compatable, but run at the speed of the slowest interface (a 2.0 device on a 1.0 controller runs at 1.0 speed, a 1.0 device on a 2.0 controller runs at 1.0 speed).

What's the frequency, Kenneth?

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Crashman   03-17-2002 at 10:29:16 PM
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SCSI is lightning fast even compared to Firewire. Firewire is 400Mbits/sec, or 50MB/s. Old UW SCSI was already 40MB/s, U2W is 80MB/s, and Ultra 3 is 160MB/s. Ultra 320 is not really in use yet. Firewire also requires no hardware configuration as SCSI does.

What's the frequency, Kenneth?

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Vince604   03-17-2002 at 11:18:13 PM
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Okay I see. But are there not a lot of devices using Firewire? Isn't SCSI a lot more common nowadays?

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Crashman   03-18-2002 at 02:04:23 AM
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SCSI is a lot more common, but becomming less so. SCSI started getting pushed out of peripherals by the inadequate USB interface because people were to stupid or lazy to set it up. That's when scanners really took a dive in speed as well.

What's the frequency, Kenneth?

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Vince604   03-18-2002 at 10:15:46 PM
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Hmm okay I see. But performance wise SCSI would be still second then right? As Firewire would be first?... and USB would be third?.

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Crashman   03-19-2002 at 12:03:19 AM
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Utra 160 is over three times as fast as firewire, Ultra 80 is almost twice as fast, Ultra is a little slower, fast wide is about half the speed, and Fast is half of that. Fast SCSI is the protocal that most SCSI peripherals use, it's 10x as fast as USB and 1.5 the speed of Firewire. It's also equal to 67x CD speed, so Fast SCSI is fast enough for everything except hard drives.

Also consider the money, SCSI scanners are about 1/5th the price of similar Firewire scanners.

What's the frequency, Kenneth?

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Vince604   03-19-2002 at 01:15:56 AM
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Hmm okay then. THanks for the reply. Well I might get a couple Ultra 160 drives later on when prices come down. But with such a fast transfer rate what advantage do you get? Like the Ultra 320 which will come out probably later this year that's twice the transfer rate of the Ultra160.

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Crashman   03-19-2002 at 03:15:46 AM
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Limmit of the PCI bus is 133, so Ultra 320 is not any faster than Ultra 160 on anything but server boards (which have 64-bit or 66MHz PCI buses).

What's the frequency, Kenneth?

Reply to Crashman
Vince604   03-19-2002 at 04:52:37 AM
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Oh okay then I see. Thanks for the info!~

Reply to Vince604
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