1 GB stick of Patriot PC3700
they do not make 1gig sticks of registered pc3700 ram this is your problem IMO..
you also will have no dual channel wiht only 1 stick of ram, lol..
2x512 will be up to 10% faster than 1x1024
bad sound is always that of a few things what other pci add in cards are being used and in what slots and useing select resourses or other things like apic..
apic is when you go from 1-15irqq's to 1-22irqs this sometimes helps but 50% of the time using certian sound devices you will run into sound issues..
what you can try is change pci latency from 32 to 64
or disable APIC but by doing this you must reformat and install the OS complety do this with only videocard+ram+cpu installed and after the OS is installed enable sound in the bios first and install the drivers when propted on reboot so the first set of resourses go to sound.
Ati x1900 Crossfire & FX-60 Dual Core[3DMark 2006=12,573