We are upgrading one of the desktops in the office. It is currently running Windows Vista x32 but we intend to upgrade to Windows 7 Pro x64.
We are also contemplating upgrading the CPU installed on the motherboard.
The motherboard is MSI K8N Neo4 Platinum (MS-7100-020) Socket 939. The CPU that is currently installed is AMD Athlon 3500+.
Here is a chart of the compatible CPUs for the motherboard: http://www.msi.com/index.php?func=prodcpusupport&maincat_no=1&cat2_no=171&cat3_no=6&prod_no=169
The desktop is mostly used for Internet, various office applications, and occasionally to run some CAD (Architectural) applications.
Which of the CPU upgrades would you recommend that would result in noticeable performance improvement?