05-12-2017 09:29 PM
Another one here. I have a T420 with 16gb pc3 12800. I believe it's Hynix. Works at pc3 1333 though.
Anyone who gets the black screen after upgrading your ram:
Turn off machine.
Remove battery, unplug adapter.
hold down power button for at least 1 minute.
Plug in the adapter, and turn on the computer.
So far, has worked for me almost every time.
06-28-2017 02:46 AM
Computers/laptops with Core 2 Duo (like Thinkpad R500) or Arrandale (like Thinkpad T410, T510, X201) support only old 4GB dual rank modules with 16 chips. Most of today's sold modules are single rank with 8 chips that work with Sandy Bridge CPUs and newer cores.
07-15-2017 03:40 PM
Just wanted to update my post from 2011. I am still running those 2 4GB Corsair DDR3 memory modules that I mentioned then, 8GB total DRAM in my Lenovo R500. No problems after another 5 years, many hours a day usage. Just replaced my keyboard for the 3rd or 4th time. Had no idea my old one was worn out. What a difference the new one makes. Don't buy a used one if you can help it, I think laptop KBs wear out faster than the desktop ones.