Nadrek (3/24/2014)
Assuming you mean a Lenovo Thinkpad T420, you could try any of these DDR3 8GB PC-10600 1.35v SODIMM modules - NO GUARANTEE whatsoever, but g.Skill, Crucial and Corsair have all done very well for me.Make sure to update your BIOS first!
Thanks for the tip, I do mean the T420s
http://shop.lenovo.com/us/en/laptops/thinkpad/t-series/t420s/[/url]
Like the 420 but slimmer and lighter.
qh