I was told by the vendor that the model is not supporting it can have a max of only 4GB. I ran CPU-Z and got the result as max support is 8 GB.
What could be the problem? What else i need to check for the RAM to upgrade it to 8GB, 2x4GB
Appreciate any help this regard.
Indeed, X201 can handle 2x4GB. The RAM stick was probably just incompatible (i.e. DDR3L instead of DDR3, wrong voltage/timings, wrong number of ranks). I don't remember exactly the details of what this generation needs, but you can find such discussions on the forum (also look for T410, T510 discussions, as they are from the same generation and have the same limitations).
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http://s186.photobucket.com/user/olex12 ... s%20Memory
1. Hynix 4Gb 2Rx8 PC3L 12800S-11-12-F3
Part #: HMT351S6EFR8A-PB N0 AA
2. Samsung 4Gb 2Rx8 PC3-12800S-11-11-F3
Part #: M471B5273DH0-CK0
Note that they are both 12800, but different timings and Hynix is 1.35V.
No errors with the mismatch though and both pass Memtest.
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Number in boldface : RAM type. No number before the hyphen means DDR1; 2 for DDR2, 3 for DDR3, etc.
An "L" after that means it's a low voltage version. This first appeared in DDR3L, as its operating voltage (1.35v) is lower than regular DDR3 (1.5v)
Number with underline : approximate peak transfer rate in megabytes/sec; to get the RAM speed, divide this number by 8, so
12800 / 8 = 1600
So, what you have are two DDR3L-1600 RAM sticks. These are generally incompatible with the X201. Stick to DDR3-1333 or DDR3-1066.
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