Topic: Crackles on Windows Vista x64 and Windows 7 x64
I recently installed Windows 7 x64 as an upgrade from XP x86 (32 bit).
Everything worked fine except for the FF800 (I was getting crackling and interrupted playback with ASIO under both Sonar 8 PE -64bit version and 32bit version- and Audition 3).
Convinced about some problem with the win7 drivers (and after a lot of testing) I decided to downgrade to Vista 64bit.
I now have Vista 64bit SP2 on my machine, but the audio crackle problem remains exactly the same.
For both installs I have used the latest drivers and firmware (driver for FF400-800 version 2.998, firmware revision 2.77). I have installed these right away, without using the ones in the RME CD first.
Before this I had a Win XP SP2 install with FF working perfectly fine with driver version 2.95 and with firmware revision 2.70.
I have checked the printed manual and then increased buffer size, HD cache, and checked PCI latency timer on the BIOS. The FW400 cable is the same I was using with the XP install, works fine and has had no movement or other use. I also have been using the DPC Latency Checker V1.1.0 tool, for the purpose of trying to determine the cause for this FF poor behavior. With Windows started in normal mode (and apps running in background only), the checker displays no problems:
When I start opening apps (even if not audio-related) I start getting some peaks:
Once I open Sonar and play a sequence, latency raises considerably (and the audio plays interruptedly):
I close the audio app (Sonar or Audition) and the conflict seems to end:
As the DPC window suggests, I've closed services, processes and applications to check if any conflict of the FF driver with something else would be to blame. I have also disabled both the onboard audio and the secondary audio card (pci E-MU 0404) but that makes no difference (that card presents no conflicts for Windows audio).
I ask the staff from RME if they can tell me what additional tests I can perform or what other settings should I be looking into.
My current system is as follows:
Intel DG33TL board
Windows Vista x64 Ultimate SP2, 8GB RAM
FF800 with latest driver/firmware
Sonar 8 PE
Current FF settings: