2GB KIT 4x 512MB For Sony VAIO PCV PCV-RS400C (Giga Pocket PVR) PCV-RS420 PCV-RS430G PCV-RS431X PCV-RS510 PCV-RS520 PCV-RZ30GN2 RZ30GN4 PCV-RZ31G RZ32G RZ34G DIMM DDR NON-ECC PC2700 333MHz RAM Memory 2GB KIT (4 x 512MB) DIMM DDR NON-ECC PC2700 333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Sony VAIO PCV. (See Compatibility List Below)