Is this memory compatible with my Sony VAIO VGN-FS415E?

Yes, this 2GB DDR2-667 SODIMM kit is designed for the VGN-FS415E and compatible VAIO FS series notebooks. Verify your system supports 2GB total capacity before upgrade.

What is the speed difference between DDR2-667 and DDR2-533?

DDR2-667 (PC2-5300) runs at 667MHz versus 533MHz for DDR2-533 (PC2-4200). The 667MHz variant offers approximately 25% higher bandwidth, improving system responsiveness.

Can I mix this with existing RAM?

Yes, you can mix DDR2-667 with same-speed modules. Avoid mixing different speeds (667 and 533MHz) as the system will downclock to the slower module's speed.

What is the voltage requirement?

DDR2-667 modules operate at 1.8V, which is standard for DDR2. This matches the VAIO VGN-FS415E specifications.

How do I install this memory?

Power off the laptop, remove the battery, locate the SODIMM slots, insert modules at a 45-degree angle, then press down firmly until retention clips lock on both sides.