Thinkpads Forum

I'm looking to upgrade a W500 to 8GB RAM.

I found and ordered this from Corsair Corsair Memory — 8GB Dual Channel DDR3 SODIMM Memory Kit (CM3X8GSDKIT1066)

However, once installed, I got the following beep code on startup: 1 - 3 - 3 - 1

The hardware manual, not so helpfully, says that error corresponds to DIMM.

Anything else I should try? Is likely the DIMMs are defective, or is there something else I need to do?

Don't get Corsair ram modules, they are notorious for incompatibility with Thinkpads.

I've had excellent luck doing 8GB upgrades on W500s and T410s using whatever cheap 4GB modules I can find at Frys or Newegg. Patriot, Adata, G.Skill, Mushkin, Samsung.