A-TECH 1GB KIT (2 x 512MB) Sony VAIO PCG PCG-FRV25 FRV27 PCG-FRV26 PCG-FRV28 PCG-FRV31 PCG-FRV33 PCG-FRV34 PCG-FRV35 PCG-FRV35Q PCG-FRV37 SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory Genuine Brand 1GB KIT (2 x 512MB) SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Sony VAIO PCG. (See Compatibility List Below)