I too have a sony vaio machine and psu PCV-RZ44G. I emailed sony about their psu's . Had to email them again asking not for a automated answer. They said this :
Thank you for contacting Sony Online Support.
As our response system is partially automated, your letter was responded to
without being read. Unfortunately, it appears that the automated message you
were sent was not applicable to your original concerns. We apologize for this
inconvenience.
The information you have requested is an unpublished specification. The hardware
(e.g. motherboard, hard drive, video graphic chipset) used in our VAIO products
are custom designed and built specifically for Sony as OEM hardware (Original
Equipment Manufacturer) from various selected manufacturers. They do not have a
direct retail counterpart model from which you can ascertain additional
information. All product support and available hardware documentation published
for your system is provided exclusively through Sony. Should we decide to
release any additional documentation, or firmware upgrades for the hardware of
your system, it will be posted on your support site.
SONY does not provide device drivers, support or troubleshooting for the
installation, configuration, or compatibility issues of third-party hardware.
Nor do we assist with the installation, configuration or troubleshooting issues
of third-party software applications. We are available to assist in resolving
technical issues with SONY supplied hardware and software only. As such, SONY
can not warrant nor guarantee the usability, or functionality, of any
third-party hardware or software installed into our VAIO systems.
We recommend you contact your third-party manufacturer for all support and
troubleshooting on the correct installation, configuration and device drivers
required for their product(s). We are certain they will be happy to help you.
NOTE: SONY does not make any warranty or representation with respect
to the performance, suitability or compatibility of products
manufactured by third-parties (other than those originally
installed with your VAIO. SONY disclaims any representation or
warranty that products from third-party manufacturers are compatible with any combination of SONY and/or non-SONY products.
Third-party manufacturers and/or their resellers are NOT
authorized to waive or vary this disclaimer.
Thank you for the opportunity to be of assistance.
Your Sony Email Response Team
CP82
Madhurjya
They ranted about device drivers I have no clue why. Anyway they didn't give me a yes or no answer about wether I can buy my own custom psu or any info about it.