Seifelden 8GB (2X4GB) Memory RAM for Sony VAIO VPCCB-3AFX VPCCB-3AFX/B VPCCB-3AFX/R VPCCB-490X VPCCB-4SFX VPCCB-4SFX/BI Free 3 year Free Replacement Warranty Seifelden 8GB (2 X 4GB) RAM Memory with 3 year free replacement warranty Improve the performance of your computer and increase your memory. Finish your work faster. Upgrading your memory is the easy and fastest solution to increase the speed of your computer 100% Guaranteed Compatible Upgrade for the listed computers models