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We recommend upgrading to the 64-bit OS along with a minimum of 4GB for home or business users (and more for performance users). The Crucial Performance and Compatibility Labs found a 22% increase in application performance when using 4GB of memory with Windows 7 64-bit when compared to 2GB and Windows 7 32-bit.
Read the full article here.
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Use the Crucial System Scanner
Crucial System Scanner tool
Scan your computer to find out what is already inside your system and get recommended upgrades.
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Windows 7 options include: OEM, Home Basic, Home Premium, Professional, Enterprise and Ultimate. The majority of users will opt for the Home Premium and Professional versions.
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The terms "32-bit" and "64-bit" refer to the way your system's CPU processes information. A 64-bit version of Windows 7 can handle large amounts of random access memory (RAM) more effectively than a 32-bit system. With ample memory, benefits include fast response time on memory-hungry applications, especially when running several programs at the same time and switching between them frequently.