@alegr said:
This is an artificial limitation, for client SKU only.
There's a good reason it's there, and not just for price points.[quote user="
Mark Russinovich"][When Microsoft enabled Physical Address Extension on Windows XP machines...] What they found was that many of the systems would crash, hang, or
become unbootable because some device drivers, commonly those for video
and audio devices that are found typically on clients but not servers,
were not programmed to expect physical addresses larger than 4GB. As a
result, the drivers truncated such addresses, resulting in memory
corruptions and corruption side effects. Server systems commonly have more generic devices and with simpler and
more stable drivers, and therefore hadn't generally surfaced these
problems. The problematic client driver ecosystem led to the decision
for client SKUs to ignore physical memory that resides above 4GB, even
though they can theoretically address it.[/quote]