09-25-2012 08:40 AM
09-25-2012 09:46 AM
It'll work fine in the X220.
I've only seen one account here claiming that the memory would operate at the higher speed spec with BIOS prior to v1.31(?), but I've seen no empirical data bearing it out.
07-10-2018 01:56 PM - edited 07-10-2018 01:57 PM
I have the most recent BIOS (fixed) and I installed DDR3-1600 and it runs fine at that speed
I am using Crucial memory, CL11 which is mediocre grade but it works
checked with CPUID and it shows memory at 1600 speed
I installed a pair of 4GB sticks for 8192MB memory
07-10-2018 02:41 PM
I recently installed (2) 8GB sticks of 1866 speed Crucial Memory in my X220. Works like a champ - so far at least. Passed all the Lenovo memory and hardware tests. CPU-Z reports running at full speed. My BIOS is version 1.26. I have read that BIOS versions above 1.28 throttle the speed to 1333 - unless you flash using a modified 3rd party BIOS update. After one of the more recent BIOS updates, you can not revert to an earlier version (for security reasons they say).
07-10-2018 02:46 PM - edited 07-10-2018 02:46 PM
I do not understand why Lenovo etc throttle memory in violation of the JEDEC standards
all it does is annoy customers who have to turn to fixed ROMs to make the machines run at their best
my i5-2520m runs well with a 480GB SSD and 8GB of RAM installed, running Windows 10 pro