Propellerhead Software
  #21  
Old 2012-12-05, 11:09
raymondh's Avatar
raymondh raymondh is offline
 
Join Date: Apr 2001
Posts: 1,065
Quote:
Originally Posted by devilfish View Post
USB has one stage more than PCI or PCIe

the Audiodriver have to wait for the OS-USB controller/driver.

USB:
Audioprogramm --> Audiodriver --> USB-Controller (WIN/MAC DRIVER) --> DA-Converter

PCI/PCIe:
Audioprogramm --> Audiodriver --> North?? or Southbridge?? --> DA-Converter


so.. in fakt the Mainboard North or Southbridge is much much faster in latency than USB.

sure it is portable .. but you never get 8 channels with 1,5ms ..
3ms not even be possible..
I agree that USB will never be as fast as a PCI card, based on technical architecture limitations.

But that is just one criteria when choosing an audio interface.

How about:
- vendor commitment to driver updates & support for new operating systems (as you pointed out)
- quality of the software driver, which can have a far more dramatic impact on latency than the connection
- heat issues inside the computer chassis, crowding, the question on whether you have a PCI slot in the first place
- isolation of the audio electronics from the stuff inside the computer
- quality of the DACs and other aspects of the audio interface
- price

I get 5ms with my Scarlett 2i2. That's fast enough for me, and it's better than the 7ms I was getting with my Creative X-Fi PCI card too (so there's more to latency than how the device is connected to the computer).

All I'm saying is that USB might just work fine, and while technically PCI may provide some advantages, a PCI based solution may not be as appropriate as a USB solution when all the other factors are weighed up...

cheers.

Last edited by raymondh; 2012-12-05 at 11:16.
  #22  
Old 2012-12-05, 11:51
devilfish's Avatar
devilfish devilfish is offline
 
Join Date: Dec 2011
Posts: 2,067
5ms ?? with USB really?

please can you check this with: http://www.thesycon.de/deu/latency_check.shtml
and post your result??

The Creative X-Fi Card is a Hifi-Soundcard for Games and Movies..
NOT a good DAW ASIO-Interface Card to make music...
In addition the driver from Creative are just scrap!


-Inside a PC you have a much better cooling than in a closed plastic coverings
-many USB-Interfaces does need a extra power supply

USB works well, no demand.
but PCI or Firewire is much more Pro-Audio gear.
USB is good for a trip, or for home recording..

all in all the production of an USB interface is more expensive.
maybe there is a need for a "good" power supply and a casing.
both a computer offers already

- isolation of the audio electronics from the stuff inside the computer

you are connectet via USB right to the mainboard.
there is no isolation. Also most major interference coming from outside.
mostly it's electric cable to be laid alongside audio cables.
or you have a bad video-graphic card. Graphics cards usually have very poor power supplies.

as I said,
I would always recommend a Firewire or PCI solution.
and if Firewire --> only RME
  #23  
Old 2012-12-05, 20:03
raymondh's Avatar
raymondh raymondh is offline
 
Join Date: Apr 2001
Posts: 1,065
Quote:
Originally Posted by devilfish View Post
5ms ?? with USB really?

please can you check this with: http://www.thesycon.de/deu/latency_check.shtml
and post your result??

The Creative X-Fi Card is a Hifi-Soundcard for Games and Movies..
NOT a good DAW ASIO-Interface Card to make music...
In addition the driver from Creative are just scrap!


-Inside a PC you have a much better cooling than in a closed plastic coverings
-many USB-Interfaces does need a extra power supply

USB works well, no demand.
but PCI or Firewire is much more Pro-Audio gear.
USB is good for a trip, or for home recording..

all in all the production of an USB interface is more expensive.
maybe there is a need for a "good" power supply and a casing.
both a computer offers already

- isolation of the audio electronics from the stuff inside the computer

you are connectet via USB right to the mainboard.
there is no isolation. Also most major interference coming from outside.
mostly it's electric cable to be laid alongside audio cables.
or you have a bad video-graphic card. Graphics cards usually have very poor power supplies.

as I said,
I would always recommend a Firewire or PCI solution.
and if Firewire --> only RME
I see that tool doesnt yet accurately support windows 8.

Like you, I use ASIO4ALL. it reports 5ms.

Cheers
 

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