Memory Upgrades FAQs

Recent Questions

• What DDR3 speeds are available?
  
• What is the difference between DDR2 and DDR3 memory?
  
• Do I need DDR2 or DDR3 memory?
  
• Why doesn't my Windows® PC recognize the whole 4GB of memory I installed?
  
• What is the difference between DDR3, DDR2, DDR, and SDRAM?
  
• The memory module I received from Crucial is a faster speed than I ordered. Will it work? Why did this happen?
  
• What is the maximum amount of RAM the Windows operating system can handle?
  
• My computer takes RDRAM. Does Crucial sell RDRAM?
  
• What is energy-efficent memory?
  
• What is the difference between PC2-4200 (DDR2-533), PC2-5300 (DDR2-667), PC2-6400 (DDR2-800), and PC2-8500 (DDR2-1066)?
  

More

• Why doesn't my Windows® PC recognize the whole 4GB of memory I installed?
  
• What is the difference between PC2100 (DDR266), PC2700 (DDR333), and PC3200 (DDR400)?
  
• What is the difference between DDR3, DDR2, DDR, and SDRAM?
  
• ECC vs. non-ECC — What do I Have and Can I Mix?
  
• What is the maximum amount of RAM the Windows operating system can handle?
  
• What is the difference between DDR and DDR2?
  
• What is the difference between PC2-4200 (DDR2-533), PC2-5300 (DDR2-667), PC2-6400 (DDR2-800), and PC2-8500 (DDR2-1066)?
  
• Does DDR or DDR2 memory need to be installed in pairs?
  
• Does DDR2 have to be installed in pairs?
  
• What is dual-channel memory?
  

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