Originally Posted by maxpan
Below is my solution to DVICO Fusion 5 Lite (RT) stuttering issues. From
what I've read so far, it will not help everyone, but hopefully will be useful.
System: MB Gigabyte GA-7N400 Pro2 (rev. 2.0), Athlon XP 3200+, X850Pro AGP,
I had a card for about a month, and it worked fine before I re-installed XP on a
new SATA drive connected to MB built-in Silicon Image 3512 controller. Since then
everytime there was a disk access I had a ~1sec freeze while viewing QAM
channels. And since my page file was on the same disk, it was unbearable.
I was sure my signal was strong and CPU was never out of %50 load boundaries.
I rebooted to my old IDE drive system and stuttering disappeared, though was
reproducible if I accessed SATA drive. Recording to this drive was out of the
question (and I bought it specifically for this purpose).
After the problem was discovered, I've searched the net and tried every option
possible: disabled most devices in BIOS, plugged Fusion 5 to every possible
PCI slot (btw irq conflict was never an issue), reconfigured WinXP for standard
PC, used all the latest software, drivers, and BIOSes (I went as far as updating
my MB BIOS with a custom version to include SI 3512 4.3.79 BIOS module).
No matter what I did the Fusion tuner was stuttering whenever SATA drive was
I don't want to think about how much time I spent trying to resolve this.... Finally
I did something that worked - I switched the access mode for my drive from
UDMA-6 to PIO-4 (using Sililcon Image software) and now all the stuttering is
gone. Completely. It can play live, time-shift, record, you name it... Flawless.
The problem? 20MB/s limitation (or is it 16MB/s?) of PIO-4. Can't go any faster.
It's still fine as a media drive to record and play but noticebly slower as the
system drive (read: forget about 15-sec XP boot times).
I don't know what's the real issue beyond this (DMA conflict?). Hopefully it can
be fixed in DVICO drivers, but in a meanwhile I recommend folks with Silicon
Image based SATA controllers to try this. You can get the software from
Silicon Image website (will not allow me to post a link).