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Firewire Bandwidth

Actually its called Firewire 400 (400mbps) which is equilant to 50MB/s (USB 2.0 is 480mbps or 60MB/s)

I believe the bandwidth limitation is in the chip not the port. So if the PCI card only has 1 firewire chip then the total bandwidth for all the ports combined will not exceed 50MB/s. You will not however have a PCI bottleneck as the PCI bus runs at 133MB/s bandwidth.

There is also a new Firewire 800 (800mbps or 100MB/s) however it used a different cable and is more expensive since its new.
 
Yes it is actually 400Mbps - got mixed up with USB 2.0 "vapor" 480Mbps limit sorry.

Yes I figured this was PER chip. The 800Mbps devices do no good if the camera doesn't support it no? I was wondering because burning DVD at 8x from another drive on same card along with camera previewing at 3MB/S doesn't seem to be creating any problems. Try doing that with USB!
 
Originally posted by: SGtheArtist
Actually its called Firewire 400 (400mbps) which is equilant to 50MB/s (USB 2.0 is 480mbps or 60MB/s)

I believe the bandwidth limitation is in the chip not the port. So if the PCI card only has 1 firewire chip then the total bandwidth for all the ports combined will not exceed 50MB/s. You will not however have a PCI bottleneck as the PCI bus runs at 133MB/s bandwidth.

There is also a new Firewire 800 (800mbps or 100MB/s) however it used a different cable and is more expensive since its new.
Click to expand...


It can also be listed as FirewireA(400) or FirewireB(800) and yes Fire800 is more expensive but look @ the results 😉

Firewire400vsUSB Hi-Speed

Firewire800



 
Firewire is a much better solution for bandwidth intensive applications such as Video, Audio, & external drives.

USB 2.0 while technically faster is usually slower in bandwidth during continuous operation due to the protocol & error correction it uses.

I really dont see the need for Firewire 800 when Firewire 400 can perform the task.

Here is an example. the band width of HDTV is about 13 or 19MB/s (1080i but im not sure) If you transfer that from the camera to the DVD burner then the Firewire 400 should be able to handle it. (19+19=38MB/s)

If you transfer the video to PC then burn it to DVD you have the full 50MB/s to transfer in & burn out the video.

Besides if the camera is using iLink, or a 4pin Firewire cable it IS a Firewire 400 and will not work the new Firewire 800 cables because they use a different plug.
 
I really dont see the need for Firewire 800 when Firewire 400 can perform the task.
Click to expand...

External HD's is one reason to exchange Data faster and most Firewire800 cards come comple with Firewire400 inputs...
 
Doubling up is always nice to prevent smacking the ole brick wall. 🙂

A two or three chip PCI-E 4X or higher device would be nice. Ditto for PCI-X.
 
Originally posted by: C6FT7
Doubling up is always nice to prevent smacking the ole brick wall. 🙂

A two or three chip PCI-E 4X or higher device would be nice. Ditto for PCI-X.
Click to expand...

LOL well actually your PCI Bandwith will get spanked before the other Proto's 😉

 
Originally posted by: LED


LOL well actually your PCI Bandwith will get spanked before the other Proto's 😉
Click to expand...

Really? With a triple the BEST case is 800x3 = 2.4Gbps or 300MB/S. Handled with either PCI-E/PCI-X with aplomb. I have a bluefish station that pushes 1GB/S sustained. I just like the convenience of 1394. USB is too much like IDE. 😛

 
I haven't seen NE other Cards than PCI and remember that PCI shares it's bandwith so I believe YES
 
Originally posted by: LED
I haven't seen NE other Cards than PCI and remember that PCI shares it's bandwith so I believe YES
Click to expand...



Hence my mention of PCI-E/PCI-X cards. I believe they do exist. I'll have to give our rep a ring.
 
Originally posted by: C6FT7
Originally posted by: LED
I haven't seen NE other Cards than PCI and remember that PCI shares it's bandwith so I believe YES
Click to expand...



Hence my mention of PCI-E/PCI-X cards. I believe they do exist. I'll have to give our rep a ring.
Click to expand...

I'd like 1 as well if they exist 😉

 
64-bit PCI is not the same as PCI Express nor PCI-X

So be careful. And if money is not a consideration the yes by all means go with Firewire 800. I was simply pointing out that the actual bandwidth of the video stream would more than be covered with a Firewire 400 chip. If you really want the bandwidth of an internal HDD outside the PC then get Firewire 800.
 
Does anyone know what the power limitation is on drawing dc from the port? Apparently i-pod devices can charge their internal cell with the 1394 connection.
 
Originally posted by: LED
Firewire rely's on external power...
Click to expand...


Not all peripheral do - I saw new ipod charge up in 174 minutes and only thing it was plugged into was the six pin 1394 port.

Obviously large disk drives and opticals need small ps in their cases as always. Limit must be low like 500 milliampere found on USB railings. The cable looks heavier on the inside but there has to be a protection device like raychem polyswitch to protect the controller from catastrophic blow out in case of peripheral malfunction!
 
IIRC FireWire is specced at up to 30v@1.5A, but the most common setup is 12v@1.5A.
 
6pin Firewire 400 supplies power where as 4pin Firewire 400 does not.

I'm not sure about the new Firewire 800 (I would assume it would supply power as well.)
 
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