Most problems with sound cards, that relate to CPU, involve the BIOS of the Motherboard. PCI interrupt sharing is rampant in most systems, and results in many of the errors.
1) Try the audiocard (with latest drivers) in various slots in your machine
2) Be sure to be doing all your testing of your add in audio card with any on the motherboard units disabled in BIOS, and with the drivers removed from your system.
3) Update your motherboard BIOS and the chipset drivers if you have not done so in awhile. This tends to correct most problems.
4) Be sure there are no "firmware" updates for your hardware.
5) Sometimes updating your other device drivers will solve errors in an unanticipated fashion.
When I build my current rig (AMD 64 4400+ and an XFi) I thought I was totally incapable of putting a computer together anymore. (I have built a bunch) The unexpected problem was the XFi Board. This was causing the error, which I was attributing to other components. When I took it out, the system loaded just fine. After reading the ABIT boards, I learned that the BIOS that came on the motherboard would not run the XFi board. After loading the new bios, I had no troubles with it either.
I have also had random errors occur with a faulty memory module, so this is another thing to swap out if you have a well running computer to put the good memory in from.
I am NOT aware that current computers can not run your card. Look into other factors. Although to be honest, my computers all run nForce boards, and I have not used a VIA chipset for awhile.