Remember, any experimentation, you do at your own risk (and/or you employers).
That said, there is, in existence, if i get this correct, a CX20641, a CX20642, and a CX20641/CX20642 (dell, iirc). 
Flow wrote:"I thought maybe playing around with hwid's in the ini files"
The .inf files are probably the only ones needing editing; to add your SUBSYS & REVision. There are also some Registry entries that would need updating with the Vostro270 original entries (if applicable).
MIXER.INI & ALTMIXER.INI are the same compared to the official w7x64 driver from dell.
Ensure you manually install only the driver in DeviceManager. Choose to "Manually Install" & indicate that you "Have Disk". Sometimes, if you get a Volume Icon in your SystemTray, yet no audio, you may need to check your Audio Properties. If the AFA or SA3 packages are causing problems, comment out those sections necessary and try again.
a side-Note:
OEM's are offered multiple choices in configuration of many Audio solutions. They tend to take advantage of the customizations wherever necessary and/or advantageous. Often they reuse these customizations and apply them to a variety of models (Chipset-dependent). There are also those which only apply to few models for a variety of reasons. Supplies of the chips themselves do change over time as new designs are realized, or old designs improved or updated.
Operating Systems and their unique Driver Models & Signing Requirements (including Cipher-strength) often change, dependent upon Windows major &/or minor version. The Driver Signing itself can be upwardly compatible. Audio drivers are often Manufacturer-specific concerning Notebooks & Tablets, as well as TouchPad (& Touch?) drivers. Manufacturers tend to focus their driver team(s) to release drivers for Operating Systems that are current, and not already or soon to be decommissioned (although Embedded XP is officially supported by MS into 2016).
I'm no expert, yet that is a distillation of what i've gleaned over time.
From your response "no" concerning HDMI, i reason that you don't have an HDMI connector on the back of your Motherboard. HDMI does usually include an Audio Device. The clear advantage of this is the one cable. Installing a PCIe Graphics card with HDMI is another potential solution (nothing fancy or expensive, or POWER-Hungry - you might only have a 300W P/S). If you have made it this far, still stymied, an addon-card or USB solution may be the last of the options available today.
side-Note #2:
How has your experience been with Intel USB 3.0 so far?
That could be a reason for adopting 7 earlier (no, i'm not a salesman), as that is the only Windows OS with an available WHQL'ed driver.
It is not just the Audio that you have no proper driver for concerning XP. Any other Windows OS is currently limited to USB 2.0, if it is set in BIOS (uEFI?).
I am uncertain of linux support for your particular intel Chipset, though it seems likely.
I suppose i would have noted this earlier, had you posted your HWid's from the Signature-linked utility
that is below this particular text.
Last edited by TechDud (2012-11-21 14:23:29)
