Capacity: 256 MB Memory Upgrade for Apple Power Mac G4 400/450/500 (Gigabit) 168 pin SDRAM DIMM Versatile Functionality: Increase bandwidth by up to 30-Percent, Reduce power consumption by up to 40-Percent and extend battery life, Faster burst access speeds for improved sequential data throughput Lifetime Warranty: If for any reason you're not completely satisfied with our RAM Memory, please feel free to contact us we will provide you with our best service possible. Easy Installation: Designed For Easy Installation And For Maximum Compatibility. Please refer to your system's manual to verify compatibility criteria. MemoryMasters provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase 256MB PC100 168 pin Non-ECC Unbuffered 3.3v SDRAM DIMM. Compatible with: Apple Power Mac G4 400/450/500 (Gigabit). System Specific memory backed by MemoryMasters .