Vista sp1 & XP SP3 official date release

[Lefteris29]

But, the service pack will indeed tweak the operating system. Namely, the changes will permit Vista SP1 to report the full quantity of RAM to users, especially if it is 4 GB. The RTM version of Vista is only able to report the system memory that is addressed, no more than 3.5 GB of RAM. At the same time, this detail is strictly dependent on the hardware infrastructure, so it will not be valid for all Vista users, SP1 or no SP1.

 

"With SP1, Windows Vista will report the amount of system memory installed rather than report the amount of system memory available to the OS. Therefore 32-bit systems equipped with 4GB of RAM will report all 4BG in many places throughout the OS, such as the System Control Panel. However, this behavior is dependent on having a compatible BIOS, so not all users may notice this change", Microsoft revealed.

 

http://news.softpedia.com/news/32-bit-Windows-Vista-SP1-to-Handle-a-Full-4-GB-of-RAM-74239.shtml