XPC SS51G

When I tried to overclock the system, some onboard devices failed to work. What could be the cause of the problem? 
For example, onboard Realtek ALC650 audio chipset is referenced to CPU host clock frequencies, it is most likely that the audio device will not function normally when you try to overclock beyond its chipset hardware specification operating frequencies. After recheck, if the problem arises due to overclocking please revert back to the original Bios default setting, and increase/fine-tune the CPU FSB and memory timings a little at a time. Enter Windows OS and test for stability and check onboard functions. It is recommended that if you want a stable ‘n’ quiet system then don't overclock and don't use aggressive Bios and memory setting. Clear CMOS data by hardware jumper is always a good option should you overclock too much and system fails to start up. Once the above issue is eliminated, but if front panel IEEE 1394 firewire, SPDIF in/out, USB, audio devices still fails to work, please check if the internal cables are connected properly. Internal cables linked from the front panel to the onboard headers may become loose or being pull off, if special care is not taken during installation of memory, IDE cables, or PCI devices. 

If you used USB keyboard on the DOS mode or Windows NT, please enables the item of "USB keyboard support" in BIOS setting (COMS Setup Utility). Else if you used it on the Windows98/ME/2000/XP, please disables the item of "USB keyboard support" at BIOS setting (COMS Setup Utility). This process is following Microsoft release information.

How to increase performance for the combination of HDD (IDE bus) and the SiS 962L chipset?
Please install the patch file 
ftp://ftp.shuttle.com/Drivers/mb/SIS/SiSide41.zip

When I use Advance Sound Manager’s Realtek AP (AvRack) under programs file to play VCD, then my system hang. How can it be solved?
1. Please download this Realtek AP patch file.
2. After that, please unzip the patch file and find the following location:
In Windows operating system: please go to my computer => Local Disk (Ex: C:\) => Program Files (Ex: C:\Program Files) => AvRack (Ex: C:\Program Files\AvRack)
3. Finally, move (copy) the new AP patch file into the AvRack folder. Click “Yes” when the message box asks overwrite (replace) the original file. 

You may need to install new AGP driver for your system from 
ftp://ftp.shuttle.com/Drivers/new/fs51/beta/