CUV4X and IRQ Sharing
The_Emperor:
I have a very similar configuration to yours and have had the same problems with periodic frame rate drop. Though it only happens in certain games, it know that it can be HUGELY annoying.
MY SYSTEM:
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Pentium III 800
ASUS CUV4X
256 MB SDRAM
ATI Radeon 7500 64 MB DDR
Soundblaster Live! Value
D-LINK DFE-530TX NIC
Windows XP Pro
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For a long time I thought it was an inadequate video card (I had an Abit NVidia GeForce MX 200), so I got the ATI Radeon 7500 - still had the same problem.
After researching and messing with this for a long time, this is what I have found:
It is definately caused by IRQ sharing, probably a conflict between the Soundblaster and video (since it seems to happen to me whenever a new environmental sound is introduced), but obviously connected with the CUV4X.
I recently did the "quick and dirty" switch to "Standard PC" from "ACPI Compliant" in the Device Manager and tested the games I had problems with. Once back in Windows, my video card, sound card and NIC were all on seperate IRQs and in the games the problem was completely resolved - I had no slowdown regardless of the sound, intense video loads or NIC activity.
That said, I now have a few other problems, including wierd sporadic system beeps under heavy HD activity and I now have to manually turn off the box after shutting down Windows.
Apparently, the best approach to killing IRQ sharing is to do a clean install of XP, press F5 during the "Setup is inspecting your system's configuration" screen and choosing "Standard PC" right from the beginning. And before you do this, make sure your BIOS is set to PnP BIOS = no. I was just too lazy to reinstall all my programs, etc.
There are tons of sites that address IRQ sharing if you are interested - just do a search. Microsoft has written several articles about it too. Here is one place to start:
http://www.anandtech.com/guides/viewfaq.html?i=47.
Hope that helps!
Later
zen