4GB Memory Module for Lenovo B590 6274 at Amazon.com
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® B590 Series - A29 at Amazon.com
Original A+ For Lenovo B590 B580 V580C motherboard Laptop main board 48.4TE05.011 HM77 Good working - Price history & Review | AliExpress Seller - Amy PC Parts Store | Alitools.io